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Claudia Conti, Jana Striova, Irene Aliatis, Elena Possenti, Geneviève Massonnet, Cyril Muehlethaler, Tommaso Poli and Matteo Positano The detection of copper resinate pigment in works of art: contribution from Raman spectroscopy Journal of Raman Spectroscopy 45

Article first published online: 2 MAR 2014 | DOI: 10.1002/jrs.4455

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Copper resinate is a green pigment widely used by the 16th century painters but its detection is up to this time an analytical challenge. This study shows how Raman spectroscopy is an effective tool able to identify this pigment in paintings. The research is focused on the exploration of the characteristic Raman signatures of commercial copper resinate in pure forms and in specimens simulating the paint layers. Six laser sources (488, 514, 532, 633, 785 and 830 nm) were used in different laboratories to highlight the drawbacks and advantages of a specific excitation source. Raman features of verdigris, a pigment commonly used for the copper resinate preparation, were also studied for comparison and the obtained results were applied in the analyses of a famous Caravaggio's painting.

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