Fig. 4From: Identification of an unusual pale green material on the surface of an ancient Chinese bronze vessel and application of laser cleaning to its removalRaman spectra of the pale green material obtained from various areas. a Testing areas on different faces of the objects from which the spectra of static scan in (b) and of extended scan in (c) were obtained. Area i: spectra a and e; area ii: spectra b and f; area iii: spectra c and g; area iv: spectra d and hBack to article page