UM EXEMPLO DE APLICACAO DA MICROSCOPIA RAMAN NA AUTENTICACAO DE OBRAS DE ARTE

摘要

In the present work, Raman Microscopy is as employed in the characterization of the pigments used in a drawing assigned to Tarsila do Amaral. one of the most important Brazilian artists. The work (colored pencil on paper), supposedly produced in the 1920 decade. is of a very simple composition, where blue, green and brown were the colors used. Prussian Blue was found as the blue pigment. whereas green was a mixture of copper phtgalocyaninc and a yellow dye, probably a diarylide: the brown pigment was a carbonaceous compound. Prussian Blue was replaced by phthalocyanine as pigment since the end of the 1930's and the possibility that it could have been used as pigment in the 1920's can he ruled out.