Chemical Cleaning of Iron Stains on Ceramics

화학세척제를 이용한 도자기의 철산화물 제거 특성 연구

  • Park, Dae-Woo (Restoration Technology Division, National Research Institute of Cultural Heritage) ;
  • Jang, Sung-Yoon (Restoration Technology Division, National Research Institute of Cultural Heritage) ;
  • Nam, Byeong-Jik (Restoration Technology Division, National Research Institute of Cultural Heritage) ;
  • Ham, Chul-Hee (Conservation Science Center, National Research Institute of Cultural Heritage) ;
  • Lim, Seong-Tae (Underwater Excavation&Conservation Division, National Research Institute of Maritime Cultural Heritage)
  • 박대우 (국립문화재연구소 복원기술연구실) ;
  • 장성윤 (국립문화재연구소 복원기술연구실) ;
  • 남병직 (국립문화재연구소 복원기술연구실) ;
  • 함철희 (국립문화재연구소 보존과학센터) ;
  • 임성태 (국립해양문화재연구소 수중발굴과)
  • Received : 2011.08.06
  • Accepted : 2011.11.17
  • Published : 2011.12.20

Abstract

To remove metal stains of the ceramics, chemical cleaning is essential case by case. This study investigated the removal characteristics of iron stains by oxalic acid and citric acid including their application methods of soaking and poultice. The soaking method in cleaning agents showed removal process by color difference and released iron contents from iron stains on ceramics. Iron stains were removed successfully from ceramics, which soaked in oxalic acid for 60 hours. However, it is recommendable to soak in 0.25M oxalic acid for one to three hours because most iron stains were disappeared in 3 hours soaking. Citric acid is less effective than oxalic acid in removing iron stains because of heavy molecular weight and low acidity. Poultices (bentonite, sepiolite, activated carbon fiber and celite) with oxalic acid were applied on contaminated ceramics. After ten hours, iron stains on ceramics were removed successfully by poultice. Among them, bentonite and sepiolite have better application. Therefore, sepiolite with 0.25M oxalic acid was applied on the iron stains of whiteware and celadon from Ma Island, and then stains were removed. However, it is judged that the application methods can be varied according to the form and depth of contaminant. In addition, the residues of poultice on the ceramics will be considered for preventing contamination.

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