Journal of Conservation Science (보존과학회지)

The Korean Society Of Conservation Science For Cultural Heritage (한국문화재보존과학회)
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Characterization of Materials and Color Formation for Black Potteries from the Proto-Three Kingdoms Period in Ulsan, Korea

울산지역 원삼국시대 흑색토기의 재질 및 발색 특성

  • Kim, Su Kyoung (Conservation Science Division, National Research Institute of Cultural Heritage) ;
  • Jang, Sungyoon (Cultural Heritage Conservation Science Center, National Research Institute of Cultural Heritage) ;
  • Lee, Chan Hee (Department of Cultural Heritage Conservation Sciences, Kongju National University)
  • 김수경 (국립문화재연구소 보존과학연구실) ;
  • 장성윤 (국립문화재연구소 문화재보존과학센터) ;
  • 이찬희 (공주대학교 문화재보존과학과)
  • Received : 2020.12.01
  • Accepted : 2020.12.31
  • Published : 2021.04.30
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Abstract

In this study, materials and color formation techniques were assessed for black potteries excavated from the Janghyeon-dong, Jungsan-dong and Gyodong-ri sites during the Proto-Three Kingdoms period in Ulsan, Korea. Although the black potteries were black superficially, the inner cores were either black or reddish yellow. Microscopy analysis identified that body clay was used for reddish iron oxide rich soils with quartz, alkali feldspar and mica, along with grains of myrmechite texture. Additionally, as marginal differences exist in the contents of SiO2, Fe2O3 and CaO, the composition of the host rock and clay distributed around the sites was affected. Thus, we can deduce that pottery was made by soiling at a short distance. Raman spectroscopy results revealed that the black layer of the black pottery was used as amorphous combustion carbon. In addition, as a transparent layer of brown lacquer was observed on the substrate that was in contact with the surface layer, the black layer of the pottery induced black color development by a combination of combustion carbon and lacquer. Based on the mineral composition and microtexture of the body clay, the firing temperature of the potteries seemed to range from 750 to 850℃, whereas the lacquer layer was pyrolyzed at 468℃ by thermal analysis. Therefore, a combined layer of combustion carbon and lacquer, which formed the black color, was painted after the body clay was fired.

이 연구에서는 울산의 원삼국시대 장현동과 중산동 및 교동리 유적에서 출토된 흑색토기에 대하여 태토의 재료학적 특성과 제작기술을 검토하였다. 흑색토기의 표면은 흑색이지만 속심은 흑색 또는 적황색을 보인다. 현미경 관찰 결과, 태토는 붉은색 철산화물이 풍부한 토양을 사용하였으며 주로 석영과 알칼리 장석 및 운모류가 동정되었고, 부분적으로 미르메카이트 조직의 입자가 관찰된다. 또한 SiO2와 Fe2O3 및 CaO 함량에서 다소 차이가 있는 것으로 보아, 각 유적지 주변에 분포하는 모암과 태토의 조성이 영향을 준 것으로 판단되며 근거리에서 채토하여 토기를 제작한 것으로 보인다. 라만분광분석 결과, 이 토기의 흑색층에는 비정질 탄소인 연매가 사용되었다. 표면층과 접하는 기질에서는 투명한 갈색의 칠이 관찰되었고 탄소가 농집된 것으로 보아, 흑색층은 연매와 옻을 칠하여 흑색발색을 유도한 것으로 해석된다. 태토의 광물조성과 미세조직으로 볼 때 이 토기의 소성온도는 750~850℃의 범위로 추정되며, 칠은 468℃에서 열분해되었다. 따라서 흑색을 이루는 연매와 칠의 혼합층은 소지의 소성 이후에 칠해진 것으로 판단된다.

Keywords

Acknowledgement

이 연구는 국립문화재연구소 문화유산조사연구의 일환으로 이루어졌음을 명기하며, 시료를 제공해 주신 울산문화재연구원과 오광섭 선생님께 감사드린다.

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