Korean Journal of Heritage: History & Science (헤리티지:역사와 과학)

National Research Institute of Cultural Heritage (국립문화재연구원)
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Application of Handheld Raman Spectroscopy for Pigment Identification of a Hanging Painting at Janggoksa Temple(Maitreya Buddha)

장곡사 미륵불 괘불탱의 채색 재료 분석을 위한 휴대용 라만 분광기의 적용성 연구

  • LEE Na Ra (Conservation Science Division, National Research Institute of Cultural Heritage) ;
  • YOO Youngmi (Conservation Science Division, National Research Institute of Cultural Heritage) ;
  • KIM Sojin (Conservation Science Division, National Research Institute of Cultural Heritage)
  • 이나라 (국립문화재연구원 보존과학연구실) ;
  • 유영미 (국립문화재연구원 보존과학연구실) ;
  • 김소진 (국립문화재연구원 보존과학연구실)
  • Received : 2023.09.15
  • Accepted : 2023.10.30
  • Published : 2023.12.30
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Abstract

The purpose of this study is to apply the handheld Raman spectrometer to identify the coloring materials used in a large Buddhist painting (of Maitreya Buddha) at Janggoksa Temple through cross-validation with HH-XRF. An in situ investigation was performed together with use of a digital microscope and HH-XRF analysis to verify the properties of pigments used in the gwaebul ("large Buddhist painting") via a non-destructive method. However, the identification of coloring materials composed of light elements and mixed or overlaid pigments is difficult using only non-destructive analysis data. Unlike in situ investigation, laboratory analysis often required samples yet the sampling is restricted to a small quantity due to the cultural heritage characteristic. Thus, it is necessary to develop a non-destructive in situ method to supplement the HH-XRF data. The large Buddhist painting at Janggoksa Temple was painted mainly using white, red, yellow, green, and blue colors. The Raman spectroscopy provides molecular information, while XRF spectroscopy provides information about elemental composition of the pigments. Analysis results identified various coloring materials: inorganic pigment, such as lead white, minium, cinnabar, and orpiment, as well as organic pigment such as gamboge and indigo. Therefore, it is possible to obtain more information for the identification of pigments; organic pigment and mixed or overlaid pigments, while at the same time minimizing the collection sample and simplifying the analysis procedure compared to previously used methods. The results of this study will be used as basic data for the analysis of painting cultural heritage through a non-destructive in situ method in the future.

본 연구는 대형불화 현장 조사에 비파괴 조사장비 중 하나인 휴대용 라만 분광기를 적용하고 그 결과를 HH-XRF 데이터와 상호 비교하여 장곡사 미륵불 괘불탱에 사용된 채색 재료를 동정하였다. 대형불화에 사용된 채색 재료 분석시, 현장에서 주로 휴대용 현미경과 HH-XRF를 이용한다. 하지만 채색 재료가 경원소로 구성되어 있거나 여러 안료가 중첩 또는 혼합 채색된 경우, 비파괴 분석 데이터만으로는 해석에 한계가 있다. 또한 문화유산이라는 특성상 수습할 수 있는 시료의 양은 제한적이어서 XRD, SEM-EDS 및 라만 분광을 이용한 정밀 분석을 수행하는데 어려움이 있다. 따라서 현장 조사 시 HH-XRF 분석 데이터를 보완할 분석기술이 필요하다. 장곡사 미륵불 괘불탱을 대상으로 백색, 적색, 황색, 녹색, 청색 색상별 채색 재료에 대하여 HH-XRF로 성분을 분석하고 휴대용 라만 분광기를 적용하여 분자구조를 확인하였다. 분석결과, 백색은 연백, 적색은 진사, 석간주, 황색은 등황, 석황, 녹색은 염화동, 청색은 쪽이 사용된 것을 확인할 수 있었다. 휴대용 라만 분광기를 적용함으로써 데이터에 대한 교차검증뿐 아니라 HH-XRF로 확인이 어려웠던 혼합 채색된 안료에 대한 식별과 유기안료에 대한 정보를 획득하는데 도움이 되었다. 또한 대형불화 등 회화문화유산의 비파괴 현장 조사에 휴대용 라만이 다양하게 활용될 수 있을 것으로 판단된다.

Keywords

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