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The Characterization of Natural Inorganic Pigment Made of Malachite and Azurite

공작석과 남동석으로 제조한 천연 무기안료의 특성 연구

  • Kang, Yeong Seok (Restoration Technology Division, National Research Institute of Cultural Heritage) ;
  • Mun, Seong Woo (Restoration Technology Division, National Research Institute of Cultural Heritage) ;
  • Park, Ju Hyeon (Restoration Technology Division, National Research Institute of Cultural Heritage) ;
  • Jeong, Hye Young (Restoration Technology Division, National Research Institute of Cultural Heritage)
  • 강영석 (국립문화재연구소 복원기술연구실) ;
  • 문성우 (국립문화재연구소 복원기술연구실) ;
  • 박주현 (국립문화재연구소 복원기술연구실) ;
  • 정혜영 (국립문화재연구소 복원기술연구실)
  • Received : 2018.11.16
  • Accepted : 2018.11.29
  • Published : 2018.12.31

Abstract

Seokrog and Seokcheong are traditional pigments that have been used as green and blue pigments in Korean traditional coloring heritage. Natural minerals such as malachite and azurite are known as raw materials. Seokrog and Seokcheong are mainly imported from aborad, such as China and Japan, and some blue pigments are reported to have been produced domestically. However, considering the geologic environment where carbonate minerals are difficult to produce, the possibility is not high. Malachite and azurite ores were purchased and analyzed for their composition. The pigments were manufactured by traditional procedure and analyzed to characterize the pigments. The Seokrog pigments had an $L^*$ value of about 59-83, an $a^*$ value of less than -20, and a slightly higher saturation than commercial products. The oil absorption was 22-29 mL/100 g, showing excellent opacity of 99.2 % or more. In the case of Seokcheong pigment, the range of $L^*$ values was 35-65 and $b^*$ values were below -15, indicating relatively lower saturation than commercial products. The oil absorption was 21-26 mL/100 g, showing an excellent opacity of 99.1 % or more like the Seokrog pigment. Azurite ore contain impurities such as malachite and quartz in addition to azurite, and the impurities contained in the pigments derived from azurite ore likely influenced on the characteristics such as their color and oil absorption.

석록과 석청은 우리나라 전통 채색 문화유산에서 각각 녹색과 청색안료로 사용되어온 전통안료이며, 천연광물인 공작석과 남동석이 원료광물로 알려져 있다. 석록과 석청은 모두 중국, 일본 등지에서 수입된 것으로 알려져 있으며, 일부 청색계열의 안료가 국내에서 산출된 기록이 있으나, 탄산염 광물이 생성되기 어려운 우리나라의 지질환경을 고려하면 가능성은 높지 않다. 무기안료인 석록과 석청의 특성을 파악하기 위해 공작석과 남동석 원료를 확보하고 성분분석을 실시하였으며, 전통제법을 적용하여 안료를 제조하고 특성을 분석하였다. 제조한 석록의 $L^*$ 값은 59-83 정도, $a^*$ 값은 -20 이하로서, 시판제품에 비해 채도가 약간 높았다. 흡유량은 22-29 mL/100 g이고, 은폐력은 99.2 % 이상으로 우수하였다. 석청의 $L^*$ 값은 35-65 범위이고, $b^*$ 값은 -15 이하로서, 시판제품에 비해 상대적으로 채도가 낮았다. 흡유량은 21-26 mL/100 g이며, 석록과 마찬가지로 은폐력이 99.1 % 이상으로 우수하였다. 남동석의 원료광물은 남동석 외에 공작석, 석영 등의 불순물이 함유하고 있으며, 석청 제조 시 혼합된 불순물이 석청안료의 색도, 흡유량 등의 특성에 영향을 미치는 것으로 판단된다.

Keywords

References

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