DETERIORATION
Satoko Taguchi¹*, Shino Okuda², and Katsunori Okajima³
¹ Tokyo University of the Arts, Tokyo, Japan.
² Doshisha Women’s College of Liberal Arts, Kyoto, Japan.
³ Yokohama National University, Yokohama, Japan.
*Corresponding author: Satoko Taguchi, taguchi.satoko@fa.geidai.ac.jp
Keywords: Ukiyo-e, deterioration, X-ray fluorescence analysis, 2D spectroradiometer, simulation.
Poster presentation video: https://youtu.be/cvlztEtStuw
In order to inherit valuable cultural properties to the future, it is necessary to control deterioration and to use various techniques for their conservation and restoration. Simulation modeling of deterioration makes it possible to predict the state of deterioration of cultural properties, which is useful information when considering the conservation or restoration of cultural properties. For more accurate prediction of deterioration, information obtained by material analysis and deterioration tests is required. Therefore, in this study, material analysis of Ukiyo-e was conducted to obtain color material information. Furthermore, we report the degradation simulation based on the data obtained from the forced degradation of color patches and Ukiyo-e based on the color material information. We measured and analyzed the Ukiyo-e “Mitate hashi zukushi Nihonbashi,” Parody of Collection of Bridges / Nihon-bashi Bridge (private collection) produced by Toyohara Kunichika (1835-1900), an Ukiyo-e artist active from the late Edo period to the Meiji period in Japan. The color materials used in the red, purple, blue, and gray areas of the Ukiyo-e were measured by X-ray fluorescence analysis and 2D spectroradiometer, and the results indicated that dyes may have been used. During the period when the Ukiyo-e shown here were produced, synthetic dyes and pigments were developed in Europe and used for coloring Ukiyo-e in Japan. The results of the analysis and reports from prior studies suggest that cochineal, methyl violet, Prussian blue, and carbon black may have been used in the red, purple, blue, and gray areas, respectively. Each color patch in the Ukiyo-e was produced using the color materials clarified by the analysis. The color patches were subjected to degradation tests using a sunlight irradiation device, assuming a situation where the patches were exposed to direct sunlight. The Ukiyo-e was also tested for degradation. The color patches and Ukiyo-e were exposed to 168 hours of irradiation using the device, and color information was obtained using a 2D spectroradiometer for 0, 8, 16, 24, 48, 72, 96, 120, 144, and 168 hours to clarify the color changes over time due to UV light. Using the information from the 10-step color patch, a degradation simulation was performed and compared with the degraded image of Ukiyo-e. The degradation simulation using color patches generally showed a fading trend like that of the Ukiyo-e while the shading of the color material and the color change of the base material, Washi (Japanese paper), was needed to be taken into consideration.
תגובות