Centro de Documentação da PJ
Analítico de Periódico
CD 294
Micro-Raman spectroscopy of carbon-based black pigments [Recurso eletrónico] / Eugenia P. Tomasini ..[et al.]
Journal of Raman Spectroscopy, Vol. 43, n. 11 (2012), p. 1671–1675
Ficheiro de 665 KB em formato PDF.
ESPECTROSCOPIA, OBRA DE ARTE, ANÁLISE DE TINTAS, ANÁLISE LABORATORIAL
Carbon-based black pigments are a wide group of dark-colored materials, which are classified according to the starting material used and their method of manufacture. Raman spectroscopy is an ideal technique for the characterization of carbonaceous matter: crystalline carbon materials present well-defined peaks, which can be easily assigned; amorphous carbon materials, on the other hand, show broad bands between 1300 and 1600 cm−1. The aim of this work was the discrimination between carbon-based pigments by micro-Raman spectroscopy. Five carbon-based pigments provided by Zecchi (lampblack, ivory black, bistre, bitumen, and graphite), two humic-earth materials [Van Dyck (Kremer) and Earth of Kassel (Zecchi)], and a commercial wood charcoal were studied. Raman spectra of all the samples showed the characteristic bands at approximately 1580 and 1350 cm−1; however, a clear difference in position, width, and relative intensity could be observed for most of the samples. The resulting analysis showed that micro-Raman spectroscopy allowed the discrimination of most of the reference pigments and allowed the identification of carbon-based black pigments in two South American colonial paintings dated from the early 18th century.
