%0 Journal Article
%T 1064 nm DISPERSIVE RAMAN MICRO-SPECTROSCOPY FOR THE IN-SITU IDENTIFICATION OF ORGANIC RED COLORANTS
%A Catherine M. Schmidt
%A Karen A. Trentelman
%J E-Preservation Science
%D 2009
%I Morana RTD d.o.o.
%X Raman spectra of red colorants were obtained in-situ using a dispersive Raman microscope equipped with a 1064 nm laser source and InGaAs array detector. By employing near-IR excitation, the fluorescence of organic colorants is significantly reduced compared to visible wavelengths. Spectra presented include alizarin crimson, lac dye, cochineal, brazilwood, dragon¡¯s blood, sandalwood, logwood,and safflower. Analyses of dry pigments versus those applied in binding media are also presented. This work demonstrates that using 1064 nm excitation in a dispersive Raman system may allow in-situ characterization of artists¡¯ materials, including organic colorants, which are challenging to analyze using visible excitation wavelengthsbecause of interfering fluorescence.
%K 1064 nm dispersive Raman spectroscopy
%K Pigment analysis
%K Traditional red artists¡¯ colorants
%U http://www.morana-rtd.com/e-preservationscience/2009/Schmidt-30-06-2008.pdf