A. Dominguez-Vidal, M. J. de la Torre-López, M. J. Campos-Suñol, R. Rubio-Domene and M. J. Ayora-Cañada Decorated plasterwork in the Alhambra investigated by Raman spectroscopy: comparative field and laboratory study Journal of Raman Spectroscopy 45
Almost all the pigments present in the decorations (cinnabar, minium, carbon black and natural lapis lazuli) together with several decay products of the red pigments were identified during the non-invasive field investigations. Complementary laboratory analysis revealed the presence of azurite severely degraded to clinoatacamite and other green decorations composed of copper hydroxychlorides with small amounts of lapis lazuli. The presence of re-decorations with overlaying layers of pigments was also investigated.
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