Newly Introduced/Updated Instruments at the Center for Conservation Science in FY2024

　In FY2024, the Conservation Science Center newly installed a Raman spectrometer, a 3D fluorescence spectrophotometer, and a high-performance liquid chromatography system, and updated the existing pyrolysis GC/MS and ion chromatograph. These instruments are introduced below. (Figure 1)

Raman spectrometer
　When a material is irradiated with laser light, the wavelength of Raman scattered light changes depending on the molecular structure of the material at the point of irradiation. Using this principle, it is possible to analyze the structure of a sample in a non-contact and non-destructive manner. For this purpose, we have introduced three types of instruments: a stationary Raman microspectroscope that can also be used for mapping, a portable Raman microspectroscope that can be carried around, and a hand-held Raman spectroscope that is compact and easy to carry around. Raman spectroscopy can be used to analyze any sample other than pure metals, whether inorganic or organic. It can be used for various applications such as identification of dyes and pigments, elucidation of the causes of corrosion, and analysis of adhering materials on cultural properties. (Figure 2)

Three-dimensional spectrofluorometer
　Since the wavelength and intensity of fluorescence emitted from a sample varies depending on its structure, fluorescence analysis can be used to estimate the structure of materials constituting cultural properties. It is a non-contact, non-destructive measurement method and can be used to analyze any sample that emits fluorescence. There are a surprisingly large number of samples that emit fluorescence (for example, fluorescence can be detected in cloth, paper, and wood in many cases), and many cultural properties can be analyzed using this method, but it is a particularly powerful analysis tool for dyes. (Figure 3)

High-performance liquid chromatography system
　Used for the determination of aldehydes in the air and dyes in textiles, this system is equipped with a PDA detector, which is more powerful than a typical UV detector for identifying unknown substances. Since extraction is required, this is basically a destructive analysis method.

Pyrolysis GC/MS (updated)
　This instrument is capable of analyzing in detail the structure of samples consisting of polymers, such as paper, fabric, lacquer, and wood. Although it is a destructive method, it is possible to analyze even a very small amount of sample (1 mg). Qualitative quantification of atmospheric odors and residual solvents is also possible.

Ion chromatograph (updated)
　This is used for the quantitative determination of ammonia and organic acids in the air, and chloride and nitrate ions in water. It employs a suppressor method and is extremely sensitive.

　We will continue to analyze cultural properties using these instruments.

It can be seen that the spectra obtained are different depending on the material colorant. A resolution of 1 µm enables identification of the colorant material. In particular, the ability to analyze inksticks nondestructively is a major feature. In addition to pigments, a wide variety of samples can be analyzed, including dyes, minerals, metal corrosion, and fibers.

Accelerated aging test causes an overall decrease in fluorescence intensity. In particular, there are marked decreases in fluorescence intensity around the excitation wavelength of 280 nm and fluorescence wavelength of 420 nm. Since the fluorescence pattern changes depending on the degree of deterioration and the material itself, it is useful for evaluating the degree of deterioration and for analyzing the differences between different materials.

Report on the Forum, “Considering the Conservation of the Museum Collections After the Suspension of the Major Fumigation Gas Sales”

The general discussion

Research introduction by organizations related to Museum IPM

　On February 21, 2025, the Center for Conservation Science (CCS) hosted a forum titled “Considering the Conservation of the Museum Collections After the Suspension of Major Fumigation Gas Sales.” This event was co-hosted by the Agency for Cultural Affairs, the Japan Society for the Conservation of Cultural Properties, and the Japan Society for Scientific Studies on Cultural Properties.

　In cases of extensive insect and mold damage, gas fumigation is used to mitigate the damage. Alternatively, gas fumigation may be utilized to prevent insects and molds from infesting incoming collections. This method has also been applied to museum collections that have suffered fungal damage due to disasters. Gas fumigation is a crucial technology for preventing biological deterioration in the conservation of museum collections in Japan. However, the sale of one of the primary fumigation gases was scheduled to cease at the end of March 2025. This decision stems from the growing awareness of the negative impact of fumigation gases on human health and the global environment.

　At the forum, experts and organizations in this field were invited to discuss alternative methods for conserving museum collections without the use of gas fumigation, in response to the contemporary societal demand for sustainable practices.

　In the keynote speeches, Mr. YONEMURA Sachio (Agency for Cultural Affairs) and Ms. KIGAWA Rika (Kyushu National Museum) spoke about the future of conservation in museum collections, focusing on Integrated Pest Management in museums (Museum IPM). Additionally, during the lunch break, Mr. WATANABE Hiroki (Kyushu National Museum) and Mr. SHIMADA Megumi (Tokyo National Research Institute for Cultural Properties) reported on international research topics related to Museum IPM. This was followed by lectures from Mr. HIDAKA Shingo (National Museum of Ethnology), Mr. IWATA Yasuyuki (Japan Institute of Insect and Fungal Damage to Cultural Properties), and Mr. MABUCHI Hajime (The National Center for the Promotion of Cultural Properties) on the practical applications of Museum IPM, the qualifications associated with it, and the theory and practice of mold control.

　The general discussion was moderated by Mr. TATEISHI Toru (The Museum of the Imperial Collections, Sannomaru Shozokan. Each speaker, including Mr. KODANI Ryusuke (Cultural Heritage Disaster Risk Management Center), Mr. WADA Hiroshi (Tokyo National Museum), Ms. FURIHATA Junko (Kyoto National Museum), Mr. WAKIYA Soichiro (Nara National Research Institute for Cultural Properties), and Mr. TAKAHATA Makoto (Imperial Household Agency) took to the stage to discuss methods for conserving museum collections without relying on gas fumigation.

　The venues were the seminar room and conference room (satellite venue) on the basement floor, and in the foyer, organizations related to Museum IPM showcased booths highlighting their recent research. Approximately 170 individuals attended in person, while around 750 accounts were registered for a simultaneous online broadcast, resulting in a substantial audience. The CCS hopes that this forum provided an opportunity to foster more dynamic discussions and enable those concerned to take meaningful steps toward addressing these issues.

Participation in the 60th Autumn Conference of the Korean Society for Conservation Science for Cultural Heritage

The 60th Autumn Conference of the Korean Society for Conservation Science for Cultural Heritage

A presentation by a participant

　A delegation from the Tokyo National Research Institute for Cultural Properties (TOBUNKEN) participated in the 60th Autumn Conference of the Korean Society for Conservation Science for Cultural Heritage, held on November 8-9, 2024, at the International Convention Center of Jeonbuk National University in Jeonju, Korea.
　At this year’s conference, a joint presentation was made by representatives from Japan and Korea in a special session, “Disaster Prevention and Preventive Conservation of Cultural Heritage Against Climate Change.” In the session, presentations by representatives from Japan by Mr. KOZUMA Yosei, Director of Cultural Heritage Disaster Risk Management Center, TATEISHI Toru, the Museum of the Imperial Collections, Sannomaru Shozokan, and Ms. HAGA Ayae, Researcher of the Center for Conservation Science. In addition, in the poster session, Mr. CHIBA Tsuyoshi, Researcher of the Center for Conservation Science, reported on the preservation of aviation materials in Japan, comparing it with designated cultural properties in Korea and discussing the challenges of the Japanese system.
　In this special session, after a discussion on how the country and the administration should respond to rescue cultural properties in the event of a disaster, reports were made on changes in the damage situation, for example damage caused by termite species, in response to actual temperature increases in individual regions. The Japanese representatives reported on the preservation of materials damaged in the Great East Japan Earthquake, and on an investigation into volatile components that can emanate from cultural properties resulting from the damage to the materials, and the impact on the materials.
　Responding to disasters does not only involve predicting and preventing damage, but also sharing 　information on a wider range of countermeasures and broadening knowledge, which will enable flexible responses and create a system with high resilience against disasters. We hope to continue such joint exchanges between Japan and Korea in the future, so that we can work together to take steps toward better cultural property preservation.

2024 Training Course for Museum Curators in Charge of Conservation (Advanced Course)

Lecture on scientific investigation

Lecture on air conditioning

Lecture on preservation of large volumes of documents

Tour of the laboratories

　The “Training Course for Museum Curators in Charge of Conservation (Advanced Course) in 2024” was held from July 10 to 14, 2024. This training course, which has been held at the Tokyo National Research Institute for Cultural Properties since 1984, was reorganized into a “Basic Course” and an “Advanced Course” in 2021, with the aim of enabling curators in charge of conservation at museums to acquire a wide range of knowledge and skills necessary for their work, from basic to advanced.

　The “Basic Course,” conducted by the National Center for the Promotion of Cultural Properties, is designed to provide curators in charge of the conservation environment in of museums with a wide range of knowledge and skills.

　The “Advanced Course” covers not only the conservation environment, but also general conservation of cultural properties, and is conducted by the Center for Conservation Science. In the 2024 Advanced Course, lectures and practical training based on research results in various research fields were conducted by the Center for Conservation Science, and lectures on the conservation and restoration of various cultural properties were provided by external lecturers. This year in particular, some of the lectures covered information on cultural property rescue in relation to the Noto Peninsula earthquake. The themes of the lectures and practical training were as follows:

・Theory of restoration of cultural properties
・Scientific investigation of cultural properties
・Air quality (about air quality / effects of air pollution on cultural properties / concepts of ventilation)
・Theory and practice of storage environment (air conditioning)
・Introduction and practice of Integrated Pest Management (IPM) for cultural properties
・Types and characteristics of restoration materials
・Deterioration and conservation of outdoor materials
・Protection of heritage of modernization
・Conservation and restoration of various cultural properties
・Disaster prevention in museums
・Conservation and restoration of folk artifacts
・Preservation of large volumes of documents, and countermeasures against deterioration
・Conservation and restoration of works on paper
・Preservation and management of photographs

　Participants commented that the training was a great support for their future activities, that they were able to deepen their knowledge of the issues they are facing, and that by coming into contact with a wide range of content, they were able to gain perspective for comprehensive consideration of environmental management and disaster prevention at their affiliated museums. This year, an opinion exchange meeting was held after the first day. Through self-introductions, participants shared their enthusiasm for the training and the issues facing their respective museums. Through this training, participants were able to interact with curators from facilities other than those in nearby prefectures, and it appeared to be a fulfilling training experience.

On-Site Inspection of the Humidity-Controlled Warm-Air Treatment Facilities for the Bell Tower of Okariden Hall

Conducting an on-site inspection.

The bell tower of Okariden Hall.

　On May 15, 2024, we visited Nikko Toshogu Shrine to inspect the “humidity-controlled warm-air treatment” facilities for the bell tower of Okariden Hall. Traditional gas fumigation for insect extermination has become difficult to continue due to safety and environmental concerns. This new treatment is a method to exterminate insects that damage the wood of structures, such as pillars and beams, by heating the wood to high temperatures (around 60℃). By controlling the humidity during the treatment to maintain a constant moisture content in the wood, it is possible to raise the temperature inside the wood without significantly affecting its physical properties. The new method is therefore expected to be a means to replace gas fumigation.
　To date, the research team, consisting of the Association for the Preservation of the Nikko World Heritage Site Shrines and Temples, Kyoto University, Total System Laboratory, Kansai Electric Power Co., Inc., KANSO Technos Co., Ltd., and the Tokyo National Research Institute for Cultural Properties (TOBUNKEN), has conducted three verification treatments on actual buildings. In addition to evaluating the insecticidal effects and impact on the structures, considerations were also given to environmental impacts such as noise and energy consumption. As a result, the humidity-controlled warm-air treatment was established as a practicable new method for insect extermination in wooden structures.
　Last year, for the first time on a designated cultural property, the treatment was carried out at the Gohotendo Hall of Rinnoji Temple. This time, it was conducted at the bell tower of Okariden Hall, marking the second case for a designated cultural property. Going forward, we aim to promote this method as the new standard for insect extermination in wooden structures.

Release of “Cultural Property Pest Search” Page on the TOBUNKEN Website

Search using morphological features as key words

　In April 2024, a new function, “Cultural Property Pest Search” (https://www.tobunken.go.jp/ccr/pest-search/top/index.html) was launched on the TOBUNKEN website. This function helps users to identify cultural property pests when they are found.
　There are many different types of cultural property pests, and it has been difficult for people who are not insect specialists to identify them. However, these pests become apparent, and there was a need to develop a tool to assist with their identification on the spot. In response to this need, this search page has been created to enable anyone to easily identify the cultural property pests.
　The “Cultural Property Pest Search” page is a web-based content search engine that can be browsed from a smartphone, so that cultural property pests can be examined immediately at the site where they are found. The search algorithm is based on morphological information such as the shape and color of the insect, which can be determined on the spot, so even if users are not familiar with insects, they can intuitively examine the pest. In addition to information on morphology and ecology, the pages returned for each pest contain many photographs from various angles for easy comparison with the insects found. The pages also contain useful information for research on cultural property pests, such as genetic information and related papers.
　As of May 2024, the “Cultural Property Pest Search” content lists 30 of the 150 known major species of cultural property pests. We will continue to expand the database to include more species in the future.

Publication of Painted Silk Database of Paintings in the Tokyo National Museum Collection

Screenshot of the painted silk database user interface

Digital microscope photograph

　Silk has been a traditional support material for Japanese and other Eastern paintings since the Tang Dynasty in China, which corresponded to the Heian period in Japan. Silk has been used mainly in clothing in East Asia from ancient times to the present. Although ancient silk clothing is rarely preserved, due to consumption, examples of painted silk have been handed down in better condition. Painted silk works can be compared in terms of their woven structure and fiber shape, as most of them were plain woven. The study of the woven structure and fiber form (composed of silk thread) of painted silk is an important research issue, not only for art historical research, but also for the history and transition of materials and techniques.

　The Tokyo National Research Institute for Cultural Properties (TOBUNKEN), established a “Memorandum of Understanding (MOU) of the Joint Research on the Composition of Silk Painting Supports and Other Textiles Used in Artworks” with the Tokyo National Museum in 2019. As a part of the research, photography and measurement of silk paintings is being conducted using a digital microscope (HiRox RH-2000), focusing on works in the Tokyo National Museum’s collection.

　We are pleased to announce that a database of the results of this project is now available as the “Tokyo National Museum Digital Research Archives,” in cooperation with the Infomatics Division of the Tokyo National Museum, accessible through the website below.

https://webarchives.tnm.jp/infolib/meta_pub/G0000002221214GK

　The database contains images of important works such as the National Treasure “The Bodhisattva Fugen,” “The Biography of the Traveling Preacher Ippen,” and “Red and White Cotton Rosemallow” by Li Di, as well as images of the woven structure and the measured data of the fiber shape. We plan to add more works to the database in the future. We will use this database to promote research on works and material techniques.

French-Japanese Workshop on Material Sciences for Cultural Heritage

A group photo of the symposium participants

　For the purpose of discussing science for cultural heritage and building new research collaborations between France and Japan, a symposium titled “French-Japanese Workshop on Material Sciences for Cultural Heritage” was held on March 13 in 2024 in the seminar room of the Tokyo National Research Institute for Cultural Properties (TOBUNKEN). The seminar was co-organized by the Embassy of France in Japan, the National Center for Research and Restoration in French Museums, the Foundation of Science for Cultural Heritage, and TOBUNKEN.

　The program of the symposium consisted of five sessions: ceramic, paper, wood, painting, and environment/sustainable conservation. On each topic, lectures were provided by French and Japanese researchers, followed by discussions. Also, a lively panel discussion followed the five sessions and went beyond a summary of the symposium to include future prospects for the sciences for cultural heritage (Participants: 61, including 8 French researchers).

　A closed roundtable meeting was held on March 14 with participation of all the speakers and moderators of the symposium. Fruitful discussions were held for establishing new research collaborations concerning sciences for cultural heritage between French and Japanese experts.

The 7th Seminar on Research and Management regarding the Conservation Environment for Cultural Properties – Sustainable Environmental Management in Consideration of Global Warming –

Workshop venue

　This seminar was jointly held by the National Center for the Promotion of Cultural Properties and Tokyo National Research Institute for Cultural Properties with the aim of gaining a common understanding of the specialized survey and evaluation methods used for the conservation environment for cultural properties, as well as of the materials and tools used in improving storage environments or providing safe storage.

　The 7th meeting, titled “Sustainable Environmental Management in Consideration of Global Warming” was held on March 1, 2024, in a conference room of the National Center for the Promotion of Cultural Properties. Dr. MIZUTANI Etsuko, a researcher with the Cultural Heritage Disaster Risk Management Center, joined in an international workshop, “Changing Climate Management Strategies Workshop” held in Melbourne, Australia, in August 2023. She shared the contents of the workshop, identified issues in this seminar, and held discussions. She talked about the outlook of the workshop, held in response to the global climate change crisis, which has increased the worldwide need to conserve and utilize cultural heritage in more sustainable ways. Lectures, practical training, and discussions were held on the issues and solutions to be implemented in museums around the world. In particular, in a lecture on the historical background of management of the conservation environment for cultural heritage, changes to the guidelines for the temperature and humidity of conservation environment were shown as essential for promoting sustainable management strategies in the future. At the same time, a lecture was held on risk assessment and monitoring methods for cultural heritage, and on the last day, there were reports and discussions about individual cases; thus, it was a very dense workshop.

　While participating in the workshop, Dr. MIZUTANI presented the participants with an issue concerning the impact of global warming on the conservation environment, and raised the subject of management of the conservation environment, and how to proceed with management strategies in Japan. There were five curators in charge of conservation or experts in conservation science at the venue in person, and 12 such persons participated in the seminar online, and these participants posed various questions related to the fundamentals of the conservation environment.

　This seminar was a good opportunity to learn about overseas trends in environmental management for the sustainable preservation of cultural properties, and to reconsider how to deal with global warming and management of the conservation environment in Japan.

Newly introduced instruments at the Center for Conservation Science in FY2023

　In FY2023, the Center for Conservation Science introduced a microtome, a biological microscope (with polarized light, phase contrast, and differential interference observation functionality), and an infrared microscope (Fig. 1). The following is an introduction of these newly introduced instruments.

Microtome
　The microtome is a device used to precisely cut samples to facilitate observation. For example, when analyzing what kind of material a piece of paper or cloth is made of, a sample is sometimes cut and its cross section is observed under a microscope. Conventionally, samples are cut with razor-sharp blades or embedded in resin and polished. However, these methods can present problems such as deformation of the specimen and difficulty in observing the specimen because it is embedded in resin, and they require skillful manipulation. The microtome solves these problems and makes it easier to identify paper and cloth materials. Figure 2 shows an example of actual cross-sectional observation results. The microtome can be applied to all cultural assets made of organic materials such as wood and lacquerware.

Biological Microscope
　Polarized light observation, phase-contrast microscopy, and differential interference microscopy are effective for observing crystal structures, microstructures, and cells and biological tissues, respectively. For example, they are effective for observing mold and bacteria on cultural properties, fibers of paper and textiles, and starch glue and other glues used for cultural properties.

Infrared microscope
　Infrared cameras are often used to observe cultural properties. This type of microscope can be used to clearly see ink lines and certain types of dyes used in calligraphy and paintings, and to identify materials and observe the underlying surface of paintings.

　We will continue to analyze cultural properties using these devices.

Figure 1. Photographs of newly introduced instruments

Microtome

Biological microscope

Infrared microscope

Figure 2. Cross section of Najio Gampi paper

Cross-section produced using a scalpel

Cross-section produced using a microtome

　When a scalpel is used to produce a cross section, a large amount of clay minerals are pressed down by the blade, covering the gampi fibers and causing them to lose their original shape. When the cross section is produced with a microtome, the gaps between fibers can be confirmed, and the hollow structure of the fibers remains intact.

Open seminar: “Preservation and Utilization of Aerial Heritage”

Presentation

Panel discussion

Exhibition

　On January 23, 2024, the Center for Conservation Science of the Tokyo National Research Institute for Cultural Properties (TOBUNKEN) held an open seminar, titled Conservation and Utilization of Aerial Heritage, in cooperation with the Japan Aeronautic Association (JAA).
　Aerial heritage, including materials related to aviation history such as drawings and photographs, are irreplaceable cultural properties in Japan’s modern and contemporary history. However, there are many differences from conventional cultural properties in terms of materials and scale, and new methods are often required for their conservation and utilization as cultural properties. The purpose of this open seminar was to rethink the current status and issues of aviation materials as cultural assets and cultural heritage.
　The opening remarks were made by Mr. SAITO Takamasa, Director General of TOBUNKEN, and Mr. SHIMIZU Shinzo, Vice President of the JAA, followed by an explanation of the purpose of the seminar by Mr. NAKAYAMA Shunsuke, Senior Fellow of the Center for Conservation Science. Mr. NAKAYAMA, Mr. KANDA Shigeyoshi of JAA, and Ms. NAKAMURA Mai, Associate Fellow of the Center for Conservation Science, gave a presentation titled “Preservation of Aviation Historical Materials and Challenges” on the results and challenges of the joint research project, “Study on the Preservation of Aviation Heritage,” that the JAA and the TOBUNKEN have been carrying out since FY2004. Mr. NAGASHIMA Hiroyuki, a former member of the JAA, gave a detailed case study report on the repair of the fabric coverings of the Type 3 Fighter “Hien,” owned by the JAA and exhibited at the Gifu-Kakamigahara air and space museum. Mr. YAMAKI Satoshi of the Chiran Peace Museum for Kamikaze Pilots in Minamikyushu City reported on the history of the Type 4 Fighter “Hayate (No. 1446),” owned by the museum, and the research activities being undertaken to preserve it. In addition, Mr. CHIBA Tsuyoshi, Researcher of the Center for Conservation Science, and Ms. HAGA Ayae Researcher of the Center for Conservation Science, gave a presentation on the status of the designation of aircraft as cultural properties in Japan and introduced the research that has been conducted as part of the “MoU for Research on Conservation and Restoration of Cultural Properties Designated by Minamikyushu City.” Following these lectures, a panel discussion was held with Mr. KANDA, Mr. NAGASHIMA, Mr. YAMAKI, and Mr. NAKAYAMA, with Mr. TATEISHI Toru, Director of the Center for Conservation Science, as a facilitator, in which participants actively exchanged opinions on the current status and issues surrounding aviation materials as cultural properties. The event ended on a high note with closing remarks by Mr. TATEISHI.
　In the foyer of the venue, we exhibited materials related to the joint research between the JAA and TOBUNKEN, including a horizontal stabilizer of a Yamazaki Type 1 “Wakamoto” glider, the vertical stabilizer of an Ito Type A2 glider, an oil painting called “Asakaze” by YAMAJI Shingo, and a Siemens-Schuckert D.IV fuselage panel.
　In all, 77 people participated in the seminar, and the post-event questions showed that there are high expectations for research and study on the preservation and utilization of modern cultural heritage, including aircraft. A report on this seminar will be published in the next fiscal year.

Workshop on the HERIe Digital Preventive Conservation Platform

Home page of HERIe website

Professor Łukasz Bratasz giving a lecture

Lecture by Dr. Michal Lukomski

Scene from the workshop

　A workshop on “Sustainable Risk Management for Collection in Museum, Utilization of HERIe Digital Preventive Conservation Platform” was held jointly by the Department of Conservation of the Graduate School of Fine Arts at the Tokyo University of the Arts, the Cultural Heritage Disaster Risk Management Center, and Tokyo National Research Institute for Cultural Properties (TOBUNKEN), on December 17, 2023.

　The HERIe Digital Preventive Conservation Platform (https://herie.pl/Home/Info) is designed to support the collaboration between museum curators and conservation professionals when assessing the conservation conditions and safety of collections for display. It is a decision-making support platform that provides a quantitative assessment of risks to collections. At the moment, it includes modules that address environmental degradation factors such as air pollutants, lighting, inappropriate temperature, and relative humidity, and modules that allow estimation of fire hazards. The platform is being developed by several institutions with financial support from the European Commission and the Getty Conservation Institute.

　The purpose of this workshop was to give museum conservators and restoration professionals experience with the use of the data of their own museums on the platform. It was a very good opportunity to invite teachers from overseas who are among the developers of this platform to hear directly about its effectiveness and how to use it, and to try it out in a classroom. As an introduction, Prof. Łukasz Bratasz of the Polish Academy of Sciences introduced the platform and explained the concept and structure, and introduced the topic of pollutants and chemical degradation in museums and galleries. Next, Dr. Michał Łukomski of the Getty Conservation Institute talked about modelling mechanical damage and using the tool to assess museum climates. Prof. Boris Pretzel (Invited Professor of Conservation Science at Tokyo University of the Arts) introduced the topic of the light degradation tool and the presentations finished with Prof. Bratasz explaining the tool for fire risk assessment. Other tools, such as the showcase tool, were also introduced and demonstrated during the day, giving all delegates a good introduction of the kind of information each tool can provide.

　Many of the participants commented that they had deepened their understanding of the platform, with remarks such as that they wanted to return to the museum and use it because they learned about a very useful tool, and that they wanted to use it to assess light damage when they brought their collection to the restoration studio.

　Since this platform is provided free of charge, we hope that it will be widely used both by those who participated, and those who could not participate in the workshop.

Field Survey in Türkiye for the Rescue of Museums and Cultural Heritage Damaged in the 2023 Earthquake

A historic building damaged, collapsed, and temporarily closed. (Hatay)

Restoration of the collapsed walls is underway at Gaziantep Castle.

Experts' seminar

　The Tokyo National Research Institute for Cultural Properties (TOBUNKEN) participated in the Emergency International Contribution Project for Cultural Heritage in FY2023 commissioned by the Agency for Cultural Affairs, Government of Japan, which was titled as “Project for supporting the Reconstruction of Damaged Cultural Heritage in Türkiye,” in cooperation with the Cultural Heritage Disaster Risk Management Center, Japan (CHDRMC).

　The primary objective of this project was to provide relief support for museums and cultural heritage damaged in the 2023 Türkiye–Syria earthquakes that occurred on February 6, 2023. In addition, by sharing Japan’s experience in rescuing damaged cultural heritage and our accumulated knowledge of cultural heritage disaster prevention with Türkiye, the project also aims to support the establishment and enhancement of a cultural heritage disaster prevention system in Türkiye.

　From November 28 to December 7, 2023, a joint team of TOBUNKEN and CHDRMC visited Türkiye to investigate the affected areas, exchange information on cultural heritage disaster prevention in both countries, and exchange opinions with their Turkish counterparts for future collaboration.

　The team visited museums and cultural heritage sites in Hatay, Gaziantep, and Şanlıurfa to ask museum staff about the response to the disaster, the current situation, and other issues, and to survey future support needs. At present, emergency measures are almost completed at the damaged museums, and full-scale work for recovery of the damaged collections and buildings is expected to be carried out in the near future. The museum in Şanlıurfa was flooded by heavy rains in early March, one month after the earthquake.

　The experts’ meeting was held at the Ministry of Culture and Tourism, Republic of Türkiye, jointly with the Ministry. The Japanese side provided an overview of cultural property disaster prevention systems in Japan, and reported on activities to rescue cultural properties damaged in the Great East Japan Earthquake and other recent disasters, as well as disaster prevention measurements at museums. The Turkish side reported on the damage to cultural properties caused by the earthquake, presented an overview of the response, and discussed disaster risk mitigation methods at museums. The parties from the two countries are continuing with further discussion regarding the direction of specific mutual collaboration and promotion of joint research on cultural property disaster prevention.

Participation in the 58th Autumn Conference of the Korean Society of Conservation Science for Cultural Heritage

A presentation by a participant

Kongju National University, the venue of the event

　Mr. CHIBA Tsuyoshi, Researcher of the Center for Conservation Science, participated in the 58th Autumn Conference of the Korean Society of Conservation Science for Cultural Heritage held at Kongju National University, South Korea, on November 10-11, 2023.
　In recent years, interest in the protection of modern cultural heritage has been increasing in South Korea. At the conference, a special session entitled “Research on Establishment of Standard Specifications for Conservation Treatment of Nationally Registered Cultural Properties (Movable Property) (1st round)” (hosted by the Cultural Heritage Administration and chaired by Dr. KIM Gyu-Ho, Kongju National University) discussed what kind of systems and conservation methods should be used to protect modern cultural heritage.
　Under the title of “Overview and Examples of Modern Cultural Heritage Protection in Japan,” Mr. Chiba reported on the current status of modern cultural heritage protection in the Japanese cultural property protection system, and outlined the characteristics of modern cultural heritage and the technical, theoretical, and institutional issues involved in its preservation.
　The modern era (Meiji era of Japan; late 19th to early 20th century) was a time of internationalization in many parts of the world, and in Japan, cultural heritage produced during this period often incorporates new materials and techniques brought from abroad. In addition to the diversification of materials and techniques, there are many unique aspects of modern cultural heritage, such as the “large number of industrial products,” and “many items still in use today.
　In addition to domestic research, international exchange is also important for the preservation of modern cultural heritage, which uses many common materials that transcend national borders, in contrast to traditional materials and techniques that are based on regional characteristics. We would like to continue to learn from each other’s efforts in both countries and deepen our research and exchange.

Conclusion of Agreement on Collaboration and Cooperation on Production of Raw Materials to Conserve Cultural Properties with Shibetu Town, Hokkaido Prefecture

Mr. Saito and Mr. Yamaguchi at the agreement signing ceremony

An exhibition on noriutsugi with panels and a documentary movie

　The Tokyo National Research Institute for Cultural Properties (TOBUNKEN) and the government council of Shibetsu Town, Hokkaido Prefecture, concluded an agreement on collaboration and cooperation, and conducted a conclusion ceremony on November 2, 2023. Though production of noriutsugi* was almost lost, the people of Shibetsu Town is now working on its revival, as an official town project. This agreement is aims to promote discussion on appropriate ways to preserve and store produced noriutsugi; interaction for scientific identification of the characteristics of neri (dispersant) extracted from noriutsugi barks and exchange and provision of any related information. Noriutsugi is a material used in the manufacture of uda washi paper, and is essential to conserve hanging scrolls. Success of the project in Shibetsu Town will lead to a sustainable and stable supply of the material.

　Four members from TOBUNKEN, including the Director General, Mr. SAITO Takamasa, participated in the ceremony. The Mayor of Shibetsu Town, Mr. YAMAGUCHI Shougo, and Mr. SAITO each provided greeting remarks and signed the agreement.

　After the ceremonial signature, the lecture session was conducted. Dr. TATEISHI Toru, Director of the Center for Conservation Science, TOBUNKEN, conducted a lecture titled The Important Role of Shibetsu Town on Cultural Property Protection in Japan about the tight relationship between cultural property protection and Shibetsu Town, including the management of the Ichani Karikariusu Historical Site. Afterwards, Dr. HAYAKAWA Noriko, Head of the Restoration Materials Section of the center, spoke about the importance of Shibetsu Town for noriutsugi-neri production in a lecture titled Cultural Property Restoration and Noriutsugi.

　At the venue of the lectures, an exhibition related to noriutsugi and uda washi paper with related materials, panels, and documentary movies used for TOBUNKEN lobby exhibition was held. Many participants attended across the Town.

　We also visited the noriutsugi planting site before and before the ceremony. We expect that further research and exchange with the people involved at the site will lead to an outcome beneficial to cultural property restoration.

*Noriutsugi-neri, a component used as a neri (dispersant), for traditional papermaking (uda washi), has been produced by barking and extracting from wild noriutsugi plants (Hydrangea paniculate); however, it has become difficult to keep producing it in the traditional way. Therefore, an attempt to produce a sustainable supply of noriutsugi-neri product by systematically harvesting noriutsugi for barking, and scientific studies are on-going.

The 15th International Conference of the Infrared and Raman Users Group (IRUG)

IRUG group photo

A practical research workshop

　The 15th International Conference of the Infrared and Raman Users Group (IRUG) was held for the first time in Asia, at the Tokyo National Research Institute for Cultural Properties (“Tobunken”) from September 26 to 29, 2023, in collaboration with the Conservation Science Laboratory of Tokyo University of the Arts (“Geidai”).
　IRUG is establishing a forum for the exchange of infrared and Raman spectroscopic information and reference spectra for the study of the world’s cultural heritage. Both FT-IR and Raman spectroscopic analytical methods are very effective for determining material information when surveying cultural properties. In recent years, the investigation of cultural properties using these analytical methods has progressed, and many results have been reported.
　There were 51 oral and poster presentations at the international conference. The keynote talk, covering aspects of the theory and challenges of reflectance-mode infrared spectroscopy, was given by Dr. James A. de Haseth, Professor Emeritus of Chemistry at the University of Georgia (USA). A featured workshop covering reflectance infrared spectroscopic techniques, with focus on data acquisition, processing, and interpretation, was led by Dr. Marcello Picollo (Senior Researcher at IFAC-CNR) and aided by Dr. Suzan de Groot (RCE, The Netherlands), Prof. Manfred Schreiner (Akademie der Bildenden Künste, Austria), with sponsorship and other aid from Thermo Fisher Scientific Corporation, and Bruker Corporation.
　Throughout the conference, active discussions were held on methods of analysis and conservation of cultural property materials. The Center for Conservation Science will continue to observe international trends as it works to advance our research projects.

Workshop on Restoration Treatments for Cultural Property – The Modular Cleaning Program Workshop

With participants after the opening ceremony

　The Center for Conservation Science regularly holds workshops inviting leading experts from outside of Japan, having started with Workshop on Restoration Treatments for Cultural Property – Cleaning with Gels and Emulsions in 2019.

　In FY 2023, with the invited guest Mr. Chris Stavroudis, American instructor, painting conservation expert, we cohosted a workshop with the National Center for Art Research on October 25 to 27, 2023, called “The Modular Cleaning Program Workshop.” In this program, the elements necessary for cultural property cleaning are determined using a unique system. This program is now widely used in the Western countries because of its good usability. This workshop was the first of its kind that he has lead in Asia, and attracted many participants.

　The workshop details are now available on the website of the National Center for Art Research: https://ncar.artmuseums.go.jp/en/reports/collections/conservation/post2023-543.html

Participation in the International Training Course “Leadership Course for Cultural Heritage Stewards in Challenging Circumstances”

Lecture on funding（Photo by Almicheal Fraay）

A presentation by a participant

Participants, teachers, and coordinators at a certification ceremony held after the training（Photo by Almicheal Fraay）

　Mr. CHIBA Tsuyoshi, Researcher of the Center for Conservation Science, participated in the “Leadership Course for Cultural Heritage Stewards in Challenging Circumstances” held in The Hague, the Netherlands, from September 24 to 29, 2023.
　This training course was organized by Cultural Emergency Response (https://www.culturalemergency.org) and the Smithsonian Cultural Rescue Initiative (https://culturalrescue.si.edu). It has been held annually since 2018, and this was the fifth session. This year there were 14 participants including Mr. CHIBA, who was the first from Japan. Among the others, there were two from Ukraine, and one each from Afghanistan, Barbados, Cameroon, Georgia, Lesotho, Namibia, Nigeria, Peru, Turkey, USA, and Vietnam.
　The training had two main aspects: “planning and proposal” and “team planning and management,” with lectures given by experts in each field. In the planning and proposal training, participants developed plans and project proposals related to the protection of cultural heritage in challenging circumstances, and effective short presentations to persuade external organizations to provide funding and support. On the final day of the training, the participants presented their projects to an audience of four representatives of the actual funding agencies, who answered their questions, offered suggestions for improvement, and critiqued them. The training in team planning and management included analyzing the “strengths” of team members and developing ideas that complement each other, leadership skills for effective team management, and attitudes for maintaining healthy mental health.
　In Japan, it seems that there has not been much interest in funding related to the protection of cultural properties, and there have been few training programs regarding this subject. However, as the situation surrounding cultural properties changes in various ways, we believe that this type of training will become increasingly important for the future protection of cultural properties and disaster prevention of cultural properties. We plan to share the contents of this training course widely in the near future.

Workshop on Basic Science for Conservators in 2023

The participants just after the opening session

A lecture in progress

　The Center for Conservation Science conducts scientific research on the conservation and restoration of cultural properties. Since FY 2021, based on our research, we have held annual workshops on basic science for conservators who have diverse experience in the restoration of cultural properties and museum curation and archiving.

　In 2023, the workshop was held for three days, from August 22 to 24. We provided lectures and practical sessions on basic scientific knowledge essential for conservation and restoration, including basic chemistry, science of adhesion and adhesives, chemistry of paper, pest damage control, and usage and disposal of chemical agents. Researchers of the Tokyo National Research Institute for Cultural Properties delivered lectures based on their expertise.

　We received 32 applications from across Japan for 15 workshop seats. Though it is unfortunate that we could not accept all, as the workshop included practical sessions, we invited 21 applicants among them. In responding to feedback received from the previous year, we tried to plan more practical contents for 2023. Participants expressed their appreciation for this workshop through the questionnaires provided. We received specific requests for disseminating scientific information used in actual conservation and restoration cases. We intend to continue this workshop series to meet these expectations.

2023 Training Course for Museum Curators in Charge of Conservation (Advanced Course)

Lecture on air conditioning

Lecture on outdoor materials

Practical training for identification of cultural property pests

Tour of the laboratories

　The “Training Course for Museum Curators in Charge of Conservation (Advanced Course) in 2023” was held from July 10 to 14, 2023. This training course, which has been held at the Institute since 1984, was reorganized into a “Basic Course” and an “Advanced Course” in 2021, with the aim of enabling curators in charge of conservation at museums to acquire a wide range of knowledge and skills necessary for their work, from basic to advanced.
The “Basic Course” is designed to provide curators in charge of the conservation of materials at museums with a wide range of knowledge and skills, from the basics to the practical. The course focuses on the conservation environment and is conducted by the National Center for the Promotion of Cultural Properties.
The “Advanced Course” covers not only the conservation environment, but also general conservation of cultural properties, and is conducted by the Center for Conservation Science. In the 2023 Advanced Course, lectures and practical training based on research results in various research fields were conducted by the Center for Conservation Science, and lectures on the conservation and restoration of various cultural properties were provided by external lecturers. On the first day, a tour of the center was conducted. The themes of the lectures and practical training were as follows:

・Theory of restoration of cultural properties
・Scientific investigation of cultural properties
・Air quality (about air quality / effects of air pollution on cultural properties / concepts of air quality improvement and ventilation)
・Theory and practice of storage environment (air conditioning)
・Introduction and practice of Integrated Pest Management (IPM) for cultural properties
・Types and characteristics of restoration materials
・Deterioration and conservation of outdoor materials
・Protection of heritage of modernization
・Conservation and restoration of various cultural properties (rescue of cultural properties / environmental management of temporary storage facilities / daily cultural heritage disaster prevention in museums)
・Disaster prevention in museums
・Conservation and restoration of folk artifacts
・Preservation of large volumes of documents, and countermeasures against deterioration
・Conservation and restoration of works on paper
・Preservation and management of photographs

　A post-training questionnaire indicated a high level of satisfaction throughout the training. Some participants commented that they were able to gain practical knowledge in a systematic manner and that they were stimulated by learning about cutting-edge research. On the other hand, we also received some comments that they would like more time for training and some requested future follow-up. We will continue to review the content of the training to ensure that it is beneficial to curators in charge of conservation.
Last year, due to restrictions imposed for protection from the spread of COVID-19, the number of participants was only 18, but this year there were 30 participants, as the infection situation had calmed down somewhat.
Although the participants come from a wide variety of institutions, they all share similar concerns and awareness of the problems they face in the field, and we believe that the exchange of ideas and opinions among the participants is very meaningful. We hope that the networking that participants were able to take part in during this training will also be useful in the future.