Research on the damage characteristics of Columba rupestris excrement to wall paintings
Bird excrement is one of the main factors causing the pollution of wall paintings and painted sculptures in grotto temples.Scientific analysis of the characteristics of damage of bird excrement to wall paintings is the premise of effective removal of such pollutants.In this study,Fourier transform infrared spectrometry(FTIR),gas chromatography-mass spectrometry(GC-MS)and X-ray diffraction(XRD)were used to analyze the composition of the Columba rupestris excrement on the surface of the wall paintings at Binglingsi Grottoes.Scanning electron microscopy-energy dispersive spectrometry(SEM-EDS),electronic digital microscopy and polarized light microscopy(PLM)were used to characterize the microscopic damage characteristics of bird excrement on the simulated wall paintings.The results show that the excrement of Columba rupestris was mainly composed of uric acid,cellulose,polypeptide organic matter,and inorganic salts(mainly quartz).The excrement caused the cover pollution of wall paintings,erosion of the pigment layer and ground layer,and destruction of the original adhesion structure between pigment particles,resulting in the peeling and shedding of the pigment layer,soluble salt activity and other biological erosion.The research results have guiding significance for the scientific protection and restoration of ancient wall paintings.
Ancient wall paintingsColumba rupestris excrementComposition and harm of excrementDamage characteristic
万方数据
维普
