重庆大足千手观音金箔表面变色原因探讨

Discussion on the Surface Darkening of Gold Foil from Thousand Hand Buddhism in Dazu County of Chongqing City

通过对大足的千手观音的金箔进行三维视频显微分析、扫描电镜分析(能谱仪)、红外光谱分析和色差计分析,对比主像两侧金箔表面物质组成,并进一步探讨金箔表面变色的原因。结果发现,暗色金箔表面含有大量CaSO4颗粒,而亮色金箔表面却未发现石膏产物,且暗色金箔表面覆盖物和其下金胶油上都分布有大量的CaSO4颗粒。

The chemistry components of the surface of gold foils, which were collected from the two sides of the main statue of Thousand Hand Buddhism in Dazu County, were analyzed by Three-Dimensional Video Microscope, Infrared Reflectance Spectrum Analysis Instrument, SEM（EDXRF） and Color Difference Meter. The results of the analysis show that there are amount of CaSO4 particles on the right gold foils of the main statue, but there are no CaSO4 particles found on the left. There are amount of CaSO4 particles on the surface cover and gold size of the right of the main statue.