Fig. 9
a the local area of green and blue-green pigment layers. In the distribution area of blue-green pigment, green pigment and blue-green pigment appear simultaneously or in layers, b and c the area where samples D1–14, D1–15, D1–18 and D1–19 are located, d and g the cross-section D1–14 and D1–15, e, f, h and i the Raman spectra of chrome yellow, emerald green, lavendulan and lamp black, respectively