Fig. 8From: Characterisation of materials and techniques in first archaeological findings of Nasca wall paintingsa Raman spectrum obtained on a white grain of 06R white paint. b It (red) is similar to the spectrum of a feldspar, such as sanidine ( (green), or petalite (purple). c Spectrum of a slightly greenish area of white paint 06R which corresponds to andesine, a plagioclase. All spectra laser 514Â nmBack to article page