Fig. 6

Raman spectra. a The green paint in sample 02V contains malachite (purple), paratacamite (green) and chrysocolla (blue). Laser: 785 nm. b In yellow paint 03J, goethite (247, 300, 390, 485, 552 cm⁻¹) (orange) and hematite (224; 295; 408; 495 cm⁻¹) (red) have been identified, laser: 532 nm. c The purple pictorial layer of the 13V sample contains hematite, laser: 785 nm. d The analyses of black paint 06R show presence of graphite (red, laser 514 nm) and quartz (blue, laser 785 nm)