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Red lakes from Leonardo's Last Supper and other Old Master Paintings: Micro-Raman spectroscopy of anthraquinone pigments in paint cross-sections

Journal article
Authors I. Osticioli
M. Pagliai
D. Comelli
V. Schettino
Austin Nevin
Published in Spectrochimica Acta Part a-Molecular and Biomolecular Spectroscopy
Volume 222
ISSN 1386-1425
Publication year 2019
Published at Department of Conservation
Language en
Links dx.doi.org/10.1016/j.saa.2019.11727...
Keywords Raman microscopy, Organic pigments, Cochineal, Kermes, Carmine, fluorescence rejection, organic colorants, cretan school, natural dyes, identification, scattering, spectra, sers, extraction, alizarin, Spectroscopy
Subject categories Spectroscopy

Abstract

The analysis of red particles in paint cross-sections from Leonardo da Vinci's Last Supper, Masolino da Panicale's wall painting Beheading of St. John the Baptist in Castiglione Olona, Tintoretto's The Discovery of the Body of Saint Mark and Paolo Veronese's Supper in the House of Simon has been carried out with micro-Raman measurements. Subtracted shifted Raman spectroscopy methods have been employed to resolve the signals in the presence of fluorescence. Taking advantage of the vibrational assignments based on recent ab initio calculations of aluminum-complexes of anthraquinones, the approach allowed the discriminate between anthraquinone dyes and lakes based on kermesic and carminic acids present in the studied samples for the first time without heavy sample treatment. (C) 2019 Elsevier B.V. All rights reserved.

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