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

지류문화재의 보채에 쓰이는 봉채의 채색 및 열화 양상 연구

  • 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)
  • 송정원 (국립문화재연구소 문화재보존과학센터) ;
  • 김명남 (국립문화재연구소 복원기술연구실) ;
  • 이장존 (국립문화재연구소 보존과학연구실)
  • Received : 2019.08.07
  • Accepted : 2019.09.17
  • Published : 2019.10.20

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.

보채는 지류문화재 보존처리의 마지막 단계로 주로 봉채를 사용한다. 본 연구는 지류문화재 보채에 쓰이는 4종의 봉채(본람, 등황, 연지, 대자)를 한지에 채색한 후 채색 양상을 확인하고 인공열화를 통해 색변화 양상을 확인하고자 하였다. 채색 양상을 관찰한 결과 본람·연지·대자는 미세한 안료 입자가 도포되는 형태였으며, 등황은 피막을 형성하였다. 봉채의 X선 회절분석 결과 본람과 연지, 대자에서 석영과 방해석, 납석이 공통적으로 검출되었고, 대자에서 침철석이 추가로 검출되었다. 인공열화 결과 습열열화에서 등황이 노란색에서 주황색으로 변색되었으며, 자외선열화에서는 등황과 연지가 탈색되었다. 결과적으로 봉채로 보채된 지류문화재는 등황이 채색된 경우 알칼리에 의해 주황색으로 변색될 수 있으며, 자외선에 의해 등황과 연지의 탈색이 우선적으로 발생하여 전체적인 색상이 어두워짐을 예측할 수 있다.

Keywords

References

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