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http://dx.doi.org/10.12654/JCS.2019.35.5.04

Study on Coloring and Aging Pattern of Bongchae used for Conservation Treatment of Paper Cultural Properties  

Song, Jung Won (Cultural Heritage Conservation Science Center, National Research Institution of Cultural Heritage)
Kim, Myoung Nam (Restoration Technology Division, National Research Institute of Cultural Heritage)
Lee, Jang Jon (Conservation Science Division, National Research Institute of Cultural Heritage)
Publication Information
Journal of Conservation Science / v.35, no.5, 2019 , pp. 416-429 More about this Journal
Abstract
Bongchae is primarily employed for toning, which is the last step in the conservation treatment of paper's cultural properties. The objective of this study is to identify the coloring patterns of four types of Bongchae(Bonram, Gamboge, Yeonji, and Daeja) and determine the associated color change patterns through accelerated aging experiments. By examining the coloring patterns, it is observed that Yeonji, Bonram, and Daeja are painted as particles, whereas Gamboge indicates a close state of coating. Results obtained from X-ray diffraction analysis of Bongchae indicate that the presence of quartz, calcite, and pyrophyllite can be equally detected in Bonram, Yeonji, and Daeja. Additionally, the presence of goethite is also detected in Daeja. Gamboge becomes discolored from yellow to orange color during wet thermal aging, and Gamboge and Yeonji become decolorized during UV irradiation aging. Hence, cultural properties of paper colored with Gamboge can be predicted to become discolored to orange color by alkalis and can be darkened by UV rays because the decolorization of Gamboge and Yeonji occurs preferentially.
Keywords
Toning; Bongchae; Pigment; Coloring; Accelerated aging;
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