「黒漆花円文螺鈿合子」の科学分析: クロスセクションATRを利用した層毎の解析

摘要

Cross-sectional analysis is widely used to analyze Japanese lacquer cultural assets. In this research, an attempt was made to use the sample used for cross-sectional analysis for mapping ATR as well. The candidate for analysis was a black lacquer lidded bowl with raden which is a Ryukyu shikki dating to around the 17th-18th century. As a result of cross-sectional analysis, three layers of lacquer were found, two of which had been applied in past restorations. Py-GC/MS of these three layers revealed that the lacquer used was Rhus verniciflua Stokes. Although it is known that other kinds of lacquer were used in Ryukyu in those days, none could be found on this sample. In addition, a small amount of drying oil was contained in the sample. Whether this drying oil is an ingredient mixed with lacquer or an ingredient of the ground could not be analyzed. Moreover, analysis by mapping ATR showed that degradation had advanced in the lacquer film of the third layer, which is the original lacquered layer.%今回の分析では，分析対象である『黒漆花円文螺鈿合子』に利用されている漆は全て中国•日本に生育している漆種であるRhus verniciflua StokesであることがPy-GC/MSである事が科学分析により示された。琉球はもともと文化の交流地点であるために，様々な材料を組み合わせて利用していたことは容易に想像が出来る。このような地域における文化財の修復の現場において，その作品の外観からのみで元の素材が何であったのかを判断することは容易で無い場合も多く存在する。そのような場面において，一つの分析試料から最大限の情報量を引き出すための分析手法は非常に重要である。