可搬型X線分析装置を用いる「国宝 紅白梅図屏風」の金地製法解明  [in Japanese] Investigation of Production Technique of the Gold Ground of Korin's "Red and White Plum Blossoms" Screen, a National Treasure, Using Portable X-ray Analytical Instruments  [in Japanese]

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Abstract

国宝 紅白梅図屏風(尾形光琳作)は,先行研究でその金地が金箔製ではない可能性が指摘され,社会的に注目された.その一方で,金地が金泥で描かれたものであると判断するに足る科学的根拠は得られておらず,金地の製法に関して疑問が残されていた.本研究では最先端の可搬型分析装置を用いたオンサイト非接触複合分析により,金地の製法解明を図った.特に金箔の延伸過程で生じる金結晶の配向現象に着目し,新規の手法として粉末X線回折法を導入し,金箔・金泥の判定を行った.粉末X線回折測定により屏風金地を分析した結果,屏風の金地部分では金結晶が<i>a</i>軸方向に選択配向していることが明らかとなった.この結果は屏風に先立って分析された現代の金箔の結果と一致した.さらに屏風の金地全体に格子状に浮き上がって見える部分については,金の厚みが2倍以上になっていることが蛍光X線装置による線分析によって示され,2枚の金箔が重なった箔足部分であることが判明した.以上の結果より,屏風の金地は金泥ではなく,金箔であることが明らかとなった.

The production technique of gold ground of a pair of folding screens by Ogata Korin, "Red and White Plum Blossoms," was investigated by using combined on-site analytical methods. In a previous study of this screen, it was pointed out that the gold ground of the screen was produced by the coating of gold paint, not an overlay of gold leaf, based on X-ray fluorescence analysis. However, there was no certain evidence of the presence of gold paint on the screen. The purpose of this study was to reveal the production technique of the gold ground of this screen by introducing new analyzing methods. We especially focused on a preferred orientation of Au crystals in the gold leaf. Since Au crystals are oriented along (100) plane in the gold leaf, X-ray powder diffractometry could be useful to distinguish between gold leaf and gold paint. We brought following three instruments : a digital microscope, a portable X-ray fluorescence spectrometer and a portable X-ray powder diffractometer to the MOA Museum of Art. They were used for nondestructive on-site analysis of the screen. Characteristic membrane-like shape was microscopically observed on the gold ground of the screen. X-ray powder diffraction patterns of the gold ground of the screen showed a strong preferred orientation parallel to the (100) plane. We also analyzed a reference picture painted with gold paint and found a striking difference between the gold paint and the gold ground of the screen. We carried out line analysis by using an X-ray fluorescence spectrometer, while focusing on a checkered pattern on the gold ground of the screen. The intensity of Au-L lines of the checkered area was a few times stronger than that of the ground part. Therefore, it was indicated that the checkered area was produced by overlapping of two gold leaves on the screen. From these observations, we have concluded that the gold ground of the screen could be produced by the gold leaf.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 60(6), 477-487, 2011-06-05

    The Japan Society for Analytical Chemistry

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Codes

  • NII Article ID (NAID)
    10029140388
  • NII NACSIS-CAT ID (NCID)
    AN00222633
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    05251931
  • NDL Article ID
    11151170
  • NDL Source Classification
    ZP4(科学技術--化学・化学工業--分析化学)
  • NDL Call No.
    Z17-9
  • Data Source
    CJP  NDL  J-STAGE 
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