Fig. 17

Raman spectra for yellow within a 13th century manuscript from Iraq (Table 1, #2) showing the use of orpiment with vermilion on one side and of pararealgar the other side—a: red particle in yellow on bird side, b: reference spectrum for vermilion, c: yellow from bird side, d: reference spectrum for orpiment, e: yellow from plant side, f: reference spectrum for pararealgar. All reference spectra from RRUFF database http://rruff.info/