Research Study on the Conservation and Restoration of Trowel Paintings on the Earthen Storehouse of the former Kina-Saffron-shu-Honpo (Part 2)
The Tokyo National Research Institute for Cultural Properties has been conducting research titled “International Research on Technology for the Conservation and Restoration of Cultural Heritage” since the fiscal year 2021. Last year, a research survey was conducted on the trowel paintings at the earthen storehouse of the former Kina-Saffron-Shu-Honpo in Nagaoka City, Niigata Prefecture. The research focused on removing contaminants such as dust, as well as identifying appropriate conservation and restoration methods for damaged areas, such as peeling and flaking, with the aim of establishing effective techniques. This research was commissioned by the government of Nagaoka City. Building on this, from 26 September to 16 October of this year, a follow-up study was conducted with the cooperation of European experts. The goal was to develop methods for reinforcing and restoring the colored layers and plaster layers, as well as techniques for retouching the decoration.
In the past, synthetic resin-based materials were used for the repair of damaged areas of these trowel paintings. However, due to the high temperature and humidity in summer and heavy snowfall during the winter, the materials had deteriorated significantly over time. At times, the restoration materials themselves contributed to the deterioration of the trowel paintings. To improve this situation, we considered introducing durable inorganic restoration materials. For the retouching, we adopted a coloring method that not only preserves the dignity of the mural, which will soon be 100 years old, but also harmonizes with the overall appearance of the entire trowel painting storage.
The conservation and restoration methods for the trowel paintings established through this series of research surveys mark the first such case in Japan from the perspective of cultural heritage preservation studies. While it will be necessary to evaluate the effectiveness of the results based on future monitoring, it can be said that a significant step forward has been made toward improving the current condition.
said that a significant step forward has been made toward improving the current condition.