Investigation of the painting materials in Zhongshan Grottoes (Shaanxi,China)

• 作 者: Ellen Egel Stefan Simon
• 机 构: RathgenResearchLaboratory,NationalMuseumsBerlin,Schlossstrasse1A,14059Berlin,Germany
• 出 处: 现代化学技术与文化遗产保护国际会议
• 发表日期: 2012年9期
• 关键词: Zhongshan China botallackite oxalate pigment FTIR spectroscopy Raman spectroscop

　　This paper reports on the characterization of paint samples from polychrome sculptures in the main cave of the Zhongshan Grottoes,China.Optical Microscopy(OM),Environmental Scanning Electron Microscopy in combination with Energy Dispersive X-ray analysis(ESEM/EDX),Fourier Transform Infrared spectroscopy(FTIR)and Raman spectroscopy were carried out in order to study the stratigraphy of the sculptural polychromy and to determine the painting materials.Mininm Pb3O4 and mercury sulphide HgS,cinnabar or its synthetic form vermilion were found as red pigments.A mixture of lead white(PbCO3)2·Pb(OH)2 and minium were used to produce a slight rose color and yellow was attributed to ochre.The green paint layer has been identified as botallackite [Cu2(OH)3Cl],an isomer of atacamite and paratacamite [1].In analogy to a study of the polychromy in Zhongshan Grottoes published recently [2],also oxalates were identified by means of FTIR,in particular calcium and copper oxalates.