| ■Tokyo National Research
Institute for Cultural Properties |
■Center for Conservation
Science |
| ■Department of Art Research,
Archives and Information Systems |
■Japan Center for
International Cooperation in Conservation |
| ■Department of Intangible
Cultural Heritage |
|
Usuki Stone Buddha Statues. This is a national treasure and a designated historic site (seated Amitabha Tathagata Buddha statue of the second group of Hoki stone buddhas)
Since 2000, the National Research Institute for Cultural Properties, Tokyo has been promoting a joint research study with Usuki City to establish the conservation plan of the Usuki Stone Buddha Statues, a national treasure and a designated historic site for the next term. On November 6th, we held report presentations on the results of research for these 10 years in the Debriefing Session on the Conservation Environment of Usuki Stone Buddha Statues at the central community hall of Usuki City.
Mr. Takeo Oku at the Agency for Cultural Affairs first made a speech on the significance of the conservation plan for the next term, followed by Mr. Shoichi Shimoyama at Kyushu University presenting a lecture on the Aso ignimbrite, on which the Usuki Stone Buddha Statues were sculpted. Then Mr. Lee Chan-hee at the Kongju National University and Mr. Kim Sa-dug at the National Research Institute for Cultural Properties in South Korea gave lectures about the survey on the deterioration states of stone cultural properties in South Korea and the conservation of them. Following these lectures, the researcher of our Institute made a report on the results of research, including the outline of research, the deterioration state of the surface of rock-carved Buddha statues, and the water and air environments. By reviewing the results of the survey on the causes of deterioration, the researcher also made some proposals about measures against deterioration, such as antifreeze measures during cold periods and measures for inquiline control, as well as deterioration monitoring techniques. Closing the session, the Usuki City Education Board presented draft plans about a conservation project for the next term and subsequent monitoring and maintenance, with a title called the Vision of Long-Span Conservation Plan for Usuki Stone Buddha Statues. They asked the participants for their understanding.
Although our research continued for an unprecedented 10 years for one cultural property, we have gained a lot of results here. We hope that these results will be utilized to conserve not only the Usuki Stone Buddha Statues, but many other stone cultural properties as well.
Inside the paper restoration studio at Deutsches Technikmuseum Berlin
From October 5th (Tuesday) to 13th (Wednesday), researchers of the Center for Conservation Science and Restoration Techniques conducted a workshop related to the restoration of paper cultural properties at the lecture room of National Berlin Asia Museum in Berlin as part of the Cooperative Program for the Conservation of Japanese Art Objects Overseas. The workshop held this year consisted of three courses – the basic course (20 people), the beginners’ course (12 people) and the intermediate course (7 people) – on hanging scrolls, targeting conservators at museums and art museums, and restorers of paper. In the basic course, a lecture was given on paper, adhesive and restoration, and conservation. In the beginners’ course, the structure and handling of hanging scrolls was explained using a model and practical training on the coloring of silk was conducted. In the intermediate course, practical training on removal and attachment of top and bottom axes and string attachment was conducted. The workshop was received well by the participants as a fulfilling workshop.
Lecture at the workshop
On October 19 (Tuesday), 2010, the National Research Institute for Cultural Properties, Tokyo hosted a workshop titled as in the above, with the co-host being the Kyushu National Museum. This workshop was intended for the persons in charge of conservation at the museums, art museums, etc. and the persons in charge of protection of cultural properties in local governmental organizations in the Kyushu, Chugoku and Shikoku districts. During this workshop, the colors of five Japanese paintings which changed due to the tent fumigation in the warehouse by use of a drug with the active ingredient of aluminum phosphide, which is not allowed to be used for the fumigation of cultural properties, was discussed. In response to this accident, we considered the urgent need to promote understanding of the fumigation of cultural properties, and held the workshop in cooperation with researchers whom are collaborative members of the Center for Conservation Science and Restoration Techniques. The following presentations were made: “Management of borrowed art objects for exhibitions” by Mr. Asaka Hiroshi, the Cultural Property Conservation Instructor at the Arts and Culture Section of the Agency for Cultural Affairs; “Details on the chemicals designated by the Japan Institute of Insect Damage to Cultural Properties” by Mr. Miura Sadatoshi, the Director of the Japan Institute of Insect Damage to Cultural Properties; “Characteristics of gas fumigant and impacts on cultural properties” by Ms. Sano Chie, the Head of the Conservation Science Section in the Center for Conservation Science and Restoration Techniques at the National Research Institute for Cultural Properties, Tokyo; and “Fumigation performed in museums – as part of IPM (Integrated Pest Management)” by Ms. Honda Mitsuko, the manager of the museum science section of the arts and culture department at the Kyushu National Museum. We reconfirmed that safety comes first for cultural properties, and appealed to the participants to take part in training, etc., collect information and improve techniques in order to facilitate the safe execution of gas fumigation used as an insecticide and fungicide (at the Kyushu National Museum, with 126 participants).
Practical session
The International Course on Restoration of Japanese Paper was held from August 30 to September 17. Among approximately 80 applicants engaged in the conservation of cultural properties around the world, ten participants from Ireland, Australia, Malaysia, etc. were selected. Various topics covered in the lectures included material studies, bibliographies and so on. In the practical sessions the participants made infillings of missing parts, lining, attached axial rods, and produced a work into a hanging scroll. They also challenged Japanese-style book binding. In the study tour, the participants visited Mino city, a place famous for handmade paper also used for restoration as well. They also visited the restoration studios, such as the traditional mounting studio and the cultural property conservation studio of the Kyoto National Museum. The handed down techniques and knowledge lead to the promotion of conservation and use of Japanese paper cultural properties, and furthermore, it is expected that they will be applied to the repairing and conservation of Japanese art objects overseas.
The first Japanese-made plane of the Imperial Japanese Army (1911)
The Center for Conservation Science and Restoration Techniques began to make public, on the National Research Institute for Cultural Properties, Tokyo website, the photos of airplanes such as the Farman, taken at the beginning of Japanese aviation at the Tokorozawa airfield. These photos were donated by Mr. Kitagawa Masanobu, whom lives in Tokorozawa in January 2009. The photos were taken by the late Mr. Kitagawa Hideo, the father of Kitagawa Masanobu, at the Tokorozawa airfield. The main recording media were glass plates. We are extremely grateful to Mr. Kitagawa Masanobu and other relevant individuals for the conservation of these glass plates and the making public of these digitized photos on the occasion of the memorable 100th year of Japanese aviation. The photos posted on this occasion include the first airplane to fly in Japan, Aikoku (Patriot)-go and many other precious shots. These will definitely be very valuable materials for researchers and people who are interested in aviation. The Center for Conservation Science and Restoration Techniques will continue to make public such valuable data in the future.
Observation of deteriorated maki-e portion by magnifying it
The Center for Conservation Science and Restoration Techniques has been investigating the deterioration of maki-e (gold-relief lacquerwork) and lacquer (urushi) coating in the main shrine of Tsukubusuma-jinja. The main shrine of Tsukubusuma-jinja, located on the Chikubujima isle in Lake Biwa, Shiga, is one of the buildings which represents the Momoyama culture. It is said that part of the palace of the Fushimi Castle was brought to this isle and reassembled to become a shrine. is shrine is famous for the lacquer (urushi) coated columns and beams running between columns, on which the paulownia and chrysanthemum crests and patterns of flowers and birds were decorated using maki-e techniques and the full-color woodcarving on the walls of nave (gejin) and doors. As 75 years have already passed since the last repairs were made, damage to the roof and coating is noticeable. Furthermore, decoration using gorgeous maki-e techniques inside the building, which is highly ranked together with that in the Koudaiji Otamaya in Kyoto, has seriously deteriorated, and has become problematic among the individuals concerned. Therefore, the Center for Conservation Science and Restoration Techniques cooperated with the repairs currently being promoted by the Shiga prefectural education board and Tsukubusuma-jinja, and conducted basic research to identify the cause of the deterioration phenomena, and then made investigation to prevent deterioration within the special environment of Lake Biwa (see Photo). We will make use of the achievements obtained on this occasion in order to conserve the valuable maki-e and lacquer (urushi) coating of the main shrine of Tsukubusuma-jinja in the best state possible.
Case study
We held the 27th training course during a period of two weeks starting July 12, and participants included 32 curators and the persons in charge of cultural properties administration nationwide. In these training sessions they focused on basic knowledge and technology concerning the conservation environment, deterioration, and restoration of various cultural properties. The course included lectures and practical training on conservation.
A practical museum environment training case study was carried out at the Sodegaura-city Folk Museum. Participants were divided into eight groups, each of which investigated the temperature, humidity, illumination, disaster prevention equipment, and conservation environment of cultural properties outdoors. They presented their results the following day, and questions and answers were provided.
The conservation of materials from the standpoint of natural science will be increasingly emphasized, which can be understood just by seeing that the “theory of museum material conservation” will be a mandatory subject in the curator programs of universities starting 2012. We will closely investigate the curriculum and content of this training course in order to enrich it while taking into consideration various signs of the times.
Exhibiting "Investigation on the cause of deterioration in mural paintings of Takamatsuzuka Tumulus" in lobby
At the present, the panels in the title are being exhibited in the entrance hall on the first floor of the Institute. This exhibition shows the outline of the results obtained by surveying the cause of deterioration in the mural paintings of Takamatsuzuka Tumulus, which were conserved at the local site since they had been found in 1972, from natural scientific and other viewpoints under the “Study team on cause of deterioration in mural paintings of Takamatsuzuka Tumulus” established in July 2008. The deterioration triggered the dismantlement of the mural paintings in 2007. The entire survey results were made public on March 24, 2010, by the Agency for Cultural Affairs, as the “Survey report on the cause of deterioration in mural paintings of Takamatsuzuka Tumulus”. This exhibition uses many illustrations and explains the survey on materials, organisms and conservation environments from the total survey. We hope that many people will visit the exhibition.
Lecture at seminar meeting
Observing many glues
The Technical Standard Section of the Center for Conservation Science and Restoration Techniques held a seminar with the title Glue – (I) at a meeting room of the Institute on June 21 (Monday). There are many kinds of glue materials, and glues are traditional adhesives that have been widely used throughout the ages all over the world including Japan. At present the production of traditional Japanese glue (nikawa) is rare and there are many unclear points regarding its current status, including its physical properties. Against this background, Ms. Hayakawa Noriko, a researcher of the Center, outlined the physical properties of glues as restoration materials. This was followed by a speech given by Ms. Yamamoto Noriko of the Association for Conservation of National Treasures on the subject how to use glues for restoration and conservation from her viewpoint as a restoration engineer. Mr. Seki Izuru, professor of the Tokyo National University of Fine Arts and Music, gave a lecture on the achievements of studies on materials from his standpoint as a painter. Finally, Mr. Morita Tsuneyuki, the professor of the Aichi Prefectural University of Fine Arts and Music, who once interviewed on the production of glues when he was a professor at the National Museum Ethnology, Osaka, gave an explanation on the glue production processes with documents. The lecturers’ speeches were persuasive because they were on subjects that the lecturers had studied throughout their long carriers; we also had an opportunity to observe many types of glue brought to the meeting room by Professor Seki Izuru, making the seminar a great success.
Lecture by Mr. Mabuchi, a visiting researcher
On June 21, we held the training course shown above, intended to transfer the latest knowledge and findings related to the conservation environment to trainees who have completed the seminar course for curators engaged in conservation. First, Mr. Yoshida, a senior researcher of the Institute, introduced the latest technological trends regarding white LEDs, which have recently seen a rapid increase in their popularity, from the viewpoint of preventing global warming. Then, Ms. Nishida Hiroko, the Deputy Director of the Nezu Museum, gave a lecture during which she brought some LEDs into the exhibition room, taking advantage of the construction of the museum. Following the lecture, Mr. Mabuchi Hajime, a visiting researcher of the Center, gave a lecture on the method of conducting microbial surveys in cultural facilities, which is his subject of research, and Ms. Sano, the head of the conservation science section, explained how to examine organic acid emitted from wood. Because the lectures for this training session covered topics that many cultural facilities have deep concerns about, approximately 100 people participated, more than in past years. At annual follow-up training sessions we will meet the needs of curators and provide them with the latest important information.
Creating hand-plate specimens for exposure test
Installing hand-plate specimens
As part of the Survey Research on Traditional Restoration Materials and Synthetic Resins project, the Center for Conservation Science and Restoration Techniques is conducting a survey on the deterioration of exterior coating material of Itsukushima Shrine. The Itsukushima Shrine is widely known for its beauty with its contrast of a vermilion shrine pavilion floating in a blue sea, but the building is exposed to a severe environment because it is in contact with seawater. And an issue raised by the relevant persons is that the vermilion exterior coating material has become black in a relatively short time. The Center for Conservation Science and Restoration Techniques tried to identify the cause of this blackening phenomenon in the laboratory, also created hand-plate specimens coated with a large amount of the past exterior coating materials which were conceivably used for Itsukushima Shrine, and installed them on the actual floor of shrine and to the pillars which are in contact with the sea surface on May 13 (see Photos 1 and 2). We will perform an exposure test in the environment of Itsukushima Shrine for at least one year and observe the deterioration of exterior coating materials. We will use the results to maintain the exterior coating of Itsukushima Shrine pavilion in as good a status as possible.
The damage caused by bark beetles and shipworms
The Center for Conservation Science and Restoration Techniques is also examining the extent of deterioration of wooden buildings in the project “Study on assessment of influence of ambient environment on cultural heritage and countermeasures.” Among the wooden buildings subject to a severe outdoor environment, particularly the Itsukushima Shrine in Miyajima-cho, Hatsukaichi City, Hiroshima faces stern conditions, such as harsh weather and the influence of seawater. It is affected by intense UV rays, wind, rain, seawater and waves, and was also heavily damaged by gribbles and shipworms under the sea. We are now studying how to prevent the wood from deteriorating in this situation, and how to restore the deteriorated wood and what restoration materials to use. Therefore, we are conducting physical tests such as a strength test, curing test and exposure test in various forms at the local site. In this way, we are investigating the optimum techniques to use. We hope that the results obtained by such examinations will be adopted for other wooden buildings.
Conservation Science No. 49
The latest edition of the research bulletin Conservation Science issued by the Center for Conservation Science and Restoration Techniques and Japan Center for International Cooperation in Conservation of the National Research Institute for Cultural Properties, Tokyo was published on March 31, 2010. This bulletin includes the latest research results of various projects conducted by our Institute. It includes research information on the conservation of Takamatsuzuka Tumulus and Kitora Tumulus and other basic studies and investigation results concerning conservation science. Please visit our website to read the entire text (PDF version):
http://www.tobunken.go.jp/~hozon/pdf/49/MOKUZI49.html
Microtremor survey conducted on Hokke-do at Todaiji temple (forced vibration)
The National Research Institute for Cultural Properties, Tokyo is advancing “research on anti-seismic measures for clay and dry-lacquered statues” as part of its research project on disaster prevention plans for cultural properties. If we can find out how Shumidan and Hokke-do vibrate, we will be able to estimate how a strong quake will affect the statues of Buddha.
We obtained the cooperation of Mie University and others, and measured microtremors in Hokke-do and Shumidan. We will analyze the results, evaluate the vibration characteristics and quake resistance of Hokke-do and Shumidan, and use the data to develop seismic countermeasures for the statues of Buddha.
Lecture at the seminar
A question and answer from the hall
The Traditional Arts Section of the Center for Conservation Science and Restoration Techniques held a seminar with the theme of “Architectural Cultural Heritage: Examination and Repair of Urushi Coating – Current State and Issues” at the seminar room of the Institute on Thursday 21st January. Currently, more than 80% of Japanese lacquer Urushi such as Johoji-urushi is used to repair the coating of architectural cultural heritage objects like the Nikko Toshogu. There is a long history and tradition in Japan for using Urushi as a coating material for architectural cultural heritage items from the past. However, Urushi has disadvantages such that it is susceptible to ultraviolet rays, wind and rain, and there are many problems in the current status and issues of repairing such heritage objects using Urushi. Tackling these problems at the seminar, Mr. Honda Takayuki of Meiji University gave us an easily understandable explanation about the deterioration mechanisms of Urushi from the standpoint of analytical chemistry. Following this, Mr. Kitano of the Traditional Arts Section showed actual examples of the Urushi coating materials used for architectural cultural heritage items in Japanese history, explained from the standpoint of coating technological history. Against this backdrop, Mr. Sato Noritake of the Nikko Cultural Assets Association for the Preservation of Shrines and Temples talked in detail about the state of various traditional coating repairs currently being executed at Nikko Toshogu from his position as an engineer who is currently repairing the coating. Finally, Mr. Nishi Kazuhiko, the Counselor in charge of buildings for the Cultural Properties Department of the Agency for Cultural Affairs, presented a lecture on the Agency’s engagement in the repair of all coatings, including Urushi, and his thoughts from the viewpoint of one who is making administrative advices. Since the lecturers were discussed about the subject of Urushi coating of architectural cultural heritage items based on the practices of science, history, restoration techniques, and administration, their stories were convincing. Various questions were asked from the hall, and resulted in a successful meeting.
Lecture presentation by Dr. Andreas Nicolai.
On January 26 (Tuesday), the above workshop was held at National Research Institute for Cultural Properties, Tokyo. Professor Grünewald of the Dresden University of Technology and Dr. Kikkawa of the Institute gave a lecture on an environmental assessment of a library and a simulation analysis concerning the risk of mold occurrence. Dr. Nicolai of the same university gave a lecture on the modeling and numeric analysis of salt movement and phase changes inside unsaturated porous building components. Dr. Plägge of the same university gave a lecture on methods for measuring the moisture characteristics of building components. This workshop comprehensively covered analytical approaches for environmental analysis, methods for measuring the building component moisture characteristics necessary for analysis, and presented a case example for when analysis is adopted for an actual building. A vigorous exchange of opinions was made possible through this event.
Lecture by Mr. Stephan Simon from Rathgen Conservation Laboratory
On December 8, 2009, we held a seminar on the theme of “energy conservation at museums with a view to maintaining an appropriate environment for cultural properties” in the seminar room of the National Institute for Cultural Properties, Tokyo, for the second straight year. This year, Dr. Stephan Simon from the Rathgen Conservation Laboratory in Germany gave a lecture under the title of “Conserving energy at museums and the conservation environment in exhibition/storage facilities in Europe”, and Professor Hokoi Shuichi from Kyoto University gave a lecture titled “Conserving energy for museums in a warmer environment”. Moreover, Dr. Ashie Yasunobu from the Ministry of Land, Infrastructure and Transport presented a lecture under the title of “Approaches for achieving sustainable urban spaces in a low-carbon society”. Finally, Dr. Kanba Nobuyuki from the Tokyo National Museum presented a lecture under the title of “Conserving cultural properties coexisting with a low-carbon society” and introduced the activities in place at the Museum. A total of 75 people participated in the seminar and held active discussions.
Removing plaster on side wall
Removed plaster piece
The Center for Conservation Science and Restoration Techniques has been removing the mural paintings of Kitora Tumulus as part of a project “Investigation on Conservation for special historic site Kitora Tumulus” entrusted by the Agency for Cultural Affairs.
Following the first work of removing in May, we continued the work in two periods of three weeks each, from October 19 to November 6, and from November 16 to December 4. Although the work in autumn took longer than that in May, performing the removal over periods of three weeks each enabled efficient removal progress. All plaster on the ceiling was detached by this latest work, and we will be able to resume removal of the plaster on the side walls for the first time in two years. We will continue to inspect the in side of the tumuls periodically, while irradiating UV-C to control microorganisms, and conduct removal again next year.
Workshop on November 20, 2009
The Center for Conservation Science and Restoration Techniques held a workshop at the conference room on the basement floor of Institute on November 20, 2009, as part of its research into measures against biodeterioration of cultural heritage. This workshop was for experts actually engaged in work at field sites and performed in round-table format so that specific discussions were fully executed. First, Mr. Harada Masahiko at the Nikko Cultural Assets Association for the Preservation of Shrines and Temples gave a lecture titled ﾒHidden insect damage at the Nikkosan Rinno-ji Temple Hondo – Treatment and Repairﾓ and talked about actual cases of damage by priobium cylindricum, which was probably the first case seen in an important cultural property. Mr. Komine Yukio of Japan Institute of Insect Damage to Cultural Properties gave a detailed report on an actual insect damage survey. Professor Fujii Yoshihisa at the Graduate School, Kyoto University gave a lecture on field surveying using resistographs and acoustic emission, and Mr. Torigoe Toshiyuki at the Kyushu National Museum gave a lecture on the detection of interior insects in analysis example of actual damaged wood using an X-ray CT for cultural heritage. Based on these lectures, active discussions were made on the future surveys and treatments and how those results are utilized in planning basic experiments and future repair. (15 participants)
General discussions
We held the 33rd International symposium on the conservation and restoration of cultural property “Restoration of Japanese Paintings – Advanced Technology and Traditional Techniques” at the Heiseikan of Tokyo National Museum for the three days from November 12 to 14. Four lectures were given from foreign countries and eleven from Japan on the restoration of Japanese paintings in order to recognize anew the materials and techniques by confirming the current status inside and outside Japan scientifically and objectively, as well as to promote the conservation and utilization of Japanese paintings owned widely in the world by sharing the knowledge acquired here. Over 350 people – restorators, conservation scientists, curators and manufacturers of traditional materials – participated in the symposium. A report on the details of lectures and discussions will be issued next year.
