Raman analysis of ninth-century Iraqi stuccoes from Samarra

Six ninth-century stucco fragments from Samarra, Iraq, and now part of the Victoria and Albert Museum collections, were analysed non-destructively and in situ in the Museum by Raman microscopy in order to determine the identities of the pigments thereon. Carbon black, haematite, gypsum, indigo, lazurite, lead white, orpiment, pararealgar, red lead, vermilion and the As₄S₄ χ-phase were detected. The detection of several arsenic-containing pigments (orpiment, pararealgar and the As₄S₄ χ-phase), known to be poisonous and carcinogenic, has prompted strict health and safety protocols to be used when the objects are handled by museum staff or displayed in the galleries. This scientific study is the first to be carried out on any of the Samarra finds.