Resonance Raman spectroscopy has been utilized to identify vegetal and animal dyes and lakes. These compounds have been used by artists since antiquity, and their identification has important implications in art history and conservation. The resonance condition is usefulwhenworkingwith real ancient objects so as to enhance the Raman scattering of chromophoreswith respect to the strong signal of the matrix, such as the textile or parchment overwhich the colorant is supported. The strong fluorescence that generally characterizes the resonance Raman spectra was eliminated by using subtracted shifted Raman spectroscopy (SSRS). A systematic study on reference organic dyes was primarily carried out to evaluate the suitability of the method and to estimate the strengths and limitations of the spectrum reconstruction process. Themethodwas then applied to the noninvasive identification ofmadder on ancient dyed silk textiles such as an altar table cloth and a manutergium attributed to the Egyptian artistic textile production of the 10th–11th Century A.D. Copyrightc 2009 JohnWiley & Sons, Ltd.
Subtracted shifted Raman spectroscopy of organic dyes and lakes
ROSI, FRANCESCA;PAOLANTONI, Marco;CLEMENTI, CATIA;DOHERTY, BRENDA;MILIANI, Costanza;BRUNETTI, Brunetto Giovanni;SGAMELLOTTI, Antonio
2010
Abstract
Resonance Raman spectroscopy has been utilized to identify vegetal and animal dyes and lakes. These compounds have been used by artists since antiquity, and their identification has important implications in art history and conservation. The resonance condition is usefulwhenworkingwith real ancient objects so as to enhance the Raman scattering of chromophoreswith respect to the strong signal of the matrix, such as the textile or parchment overwhich the colorant is supported. The strong fluorescence that generally characterizes the resonance Raman spectra was eliminated by using subtracted shifted Raman spectroscopy (SSRS). A systematic study on reference organic dyes was primarily carried out to evaluate the suitability of the method and to estimate the strengths and limitations of the spectrum reconstruction process. Themethodwas then applied to the noninvasive identification ofmadder on ancient dyed silk textiles such as an altar table cloth and a manutergium attributed to the Egyptian artistic textile production of the 10th–11th Century A.D. Copyrightc 2009 JohnWiley & Sons, Ltd.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
