重庆大足大佛湾彩绘绿色和蓝绿色颜料的分析研究

为了确定重庆大足大佛湾彩绘含铜、砷元素的绿色及蓝绿色颜料显色成分,应用便携式X射线荧光光谱仪(XRF)、便携式显微镜等无损调查方法,结合X射线衍射分析仪(XRD)、扫描电镜-能谱仪(SEM-EDX)、X射线光电子能谱分析仪(XPS)、显微拉曼光谱仪(RM)等分析方法,对取自大佛湾塑像的绿色及蓝绿色颜料进行调查和分析。结果表明绿色颜料显色成分为为巴黎绿,蓝绿色颜料显色成分为氯砷钠铜石[NaCaCu₅(AsO₄)₄Cl·5H₂O]。根据研究结论推断,氯砷钠铜石可能为巴黎绿的变色产物。该结果为探讨近代人工合成颜料变色机理提供了新的线索和方法。

Study of copper and arsenic-containing green and blue-green pigments of rock carvings at Big Buddha Bay in Dazu

The chromogenic copper and arsenic-containing green and blue-green pigments of rock carvings at Big Buddha Bay in Dazu, Chongqing, were investigated and analyzed using portable X-ray fluorescence spectrometry (XRF), portable microscopy and other non-destructive analysis methods in combination with X-ray diffraction (XRD), scanning electron microscopy-energy dispersive X-ray spectrometry (SEM-EDX), X-ray photoelectron spectrometry (XPS) and micro Raman spectrometry (RM). The results show that the chromogenic component of the green pigment is emerald green , and that of blue-green pigment is lavendulan [NaCaCu₅(AsO₄)₄Cl·5H₂O]. Also, it is inferred that lavendulan is a discoloration product of emerald green, based on this research. This work provides new clues to and methods for research on the chromogenic changes in modern synthetic pigments.