Journal Article 〔報告〕国宝「阿弥陀聖衆来迎図」の彩色材料に関する調査

武田, 裕子  ,  早川, 泰弘

The three scrolls of Amida Shoju Raigo-zu (Descent of Amitabha and the Heavenly Multitude), a national treasure, collected in the Koyasan Yushi-hachimanko Juhachi-kain is one of the largest paintings of raigo-zu in the Heian period.Amitabha in the center of the painting has now become brownish.Recent study has pointed out that parts of Amitabha’s lotus seat and clothes may have been decorated by reverse leafing, a technique in which gold leaf is applied on the back side of the silk. In 2011, scientific investigation using a portable X-ray fluorescence spectrometer and digital single lens reflex camera with macro lens was carried out to confirm the reverse leafing and painting materials.Based on information obtained from the scientific investigation, painting samples were drawn using different kinds of colorants. From the scientific investigation and observation of the painting samples, the following facts were revealed.On the back side of the silk where the body,clothes and lotus seat of Amitabha were painted,reverse leafing technique had been used.On the front side where the body of Amitabha was painted,gold pigment had been used.Clothes and lotus seat had been painted with pigments and organic dyes from the front side of the silk and further decorated with kirikane, a technique in which designs and patterns are expressed by thin strips of gold leaf.Thus it was found that the technique used in this painting is very unique as compared with those used in other Buddhist paintings of the same period.

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