利用显微镜、扫描电镜和激光拉曼光谱技术对库木吐喇石窟壁画铅颜料进行分析,结果显示棕黑色颜料是二氧化铅和铅丹,橘红色和棕红色颜料是铅丹。采用拉曼光谱检测铅颜料,选择恰当的激光波长和检测功率是获取准确分析结果的关键,较长的激光波长和低的功率能确保铅颜料稳定。研究还发现了石窟壁画颜料铅丹的变色现象。

Light microscopy,scanning electron microscopy,and Raman spectra were applied to analyze the lead pigments in Kumutula Grotto murals.The results show that the brown black pigment was lead dioxide and red lead,orange red and brown red pigments were red lead.The key point of the lead pigments was the selection of appropriate laser wavelength and power.The lead pigments was stable when analysed with a laser beam of longer wavelength and suitably low power.Meanwhile,the discoloration of red lead was discovered.