Fig. 6

Raman spectra of the pigment layers of samples PCH03, PCH04, PCH07, and PCH08. Asterisk indicates signal of the poly(methyl methacrylate) resin

Raman spectra of the pigment layers of samples PCH03, PCH04, PCH07, and PCH08. Asterisk indicates signal of the poly(methyl methacrylate) resin