〔報告〕伊藤若冲『動植綵絵』に見られる青色材料

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タイトル別名
  • Blue-colored Materials Used in Doshoku Sai-e (Colorful Realm of Living Beings) by Ito Jakuchu

説明

The thirty scrolls of Doshoku Sai-e (Colorful Realm of Living Beings) collected in the Sannomaru Shozokan are lifework masterpieces of Ito Jakuchu (1716-1800). The National Research Institute for Cultural Properties, Tokyo and the Sannomaru Shozokan cooperatively investigated painting materials and drawing techniques of Doshoku Sai-e during their restoration from 1999 to 2005. The analytical results of painting materials using a portable X-ray fluorescence spectrometer are reported in the previous paper. In this paper, the results of additional investigation for blue-colored materials after their restoration are presented. In the previous paper, we reported that two kinds of blue-colored materials were used in the thirty scrolls. One is azurite (2CuCO3·Cu(OH)2)）containing copper as a major component and the other is an organic dye which could not be identified. In the additional X-ray fluorescence analysis, another blue-colored material containing iron was found. The material is used only in the drawing of a small fish in No.28 “The Figure of Fish.” In order to identify this blue-colored material, visible light reflectance spectrometry was applied. As a result, the material has been identified to be prussian blue (Fe4[Fe(CN)6]3), which was a pigment artificially-prepared in Germany in 1704 and was first imported to Japan in 1747. Thus, “The Figure of Fish” in Doshoku Sai-e is positioned as one of the earliest paintings using prussian blue in Japan. Visible light reflectance spectrometry also revealed that the blue-colored organic dye was indigo.

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