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LIBS applied to the analysis and identification of inorganic pigments in paintings of two equatorian artists, antonio salas and Joaquín Pinto

Abstract:

In this work we demonstrate the use of LIBS spectroscopy as a fast and reliable method for identification of some inorganic pigments in selected artworks ascribed to the nineteenth-century ECUian painters Antonio Salas and Joaquín Pinto. This effort intends to provide analytical information to historians, restorers or art evaluators on the nature of the pigments, and on the working technique of these authors in general. Most of the patrimonial works studied could not be removed from their exhibition venues and the analysis was performed in situ. For this, we built a portable LIBS instrument composed of a Nd:YAG laser, a portable spectrometer, an optical fiber, two lenses and suitable supporting structures. This work allowed the identification of the inorganic pigments used for the colors red, white, green, blue and incarnations with great confidence. © Sociedad Española de Óptica.