Abstract
Copper phthalocyanine (CuPc) blue, commonly named phthalo blue is the most important synthetic organic blue pigment in the twentieth and twenty-first century artists paints. Phthalo blue, which is adopted by artists since 1936, is a polymorphous pigment. Currently, the α, β and \(\varepsilon\) CuPc polymorphs are used in artists paint formulations. The identification of the CuPc crystal form provides technical and chronological information relevant for studying artworks. Raman Spectroscopy (RS) is a very valuable technique for the detection of phthalo blue in paint layers. However, the spectral interpretation is not straightforward concerning the CuPc polymorph distinction. To overcome the problem we have previously developed a procedure combining RS and chemometrical analysis. The experimental results that we obtained have demonstrated its efficiency for predicting the CuPc crystal form in unknown paint samples. In the present work, this procedure was applied on oil-based and acrylic paints from Sam Francis’ studio and the Getty Conservation Institute (GCI) Reference Collection.
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Acknowledgements
This work was supported by the Inter-University Attraction Pole program of the Federal Belgian Science Policy (NACHO P6/16), the University of Liège, and the Institut Interuniversitaire des Sciences Nucléaires. The authors wish especially to thank Sylvia Lycke from the Raman Spectroscopy Research Group (Ghent) for the technical support and, Rachel Rivenc and Art Kaplan from the Getty Conservation Institute (Los Angeles) for the sample informations.
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Defeyt, C., Van Pevenage, J., Vandenabeele, P., Learner, T., Strivay, D. (2014). Distinction by Micro-Raman Spectroscopy and Chemometrical Analysis of Copper Phthalocyanine Blue Polymorphs in Oil-Based and Acrylic Paint Samples. In: van den Berg, K., et al. Issues in Contemporary Oil Paint. Springer, Cham. https://doi.org/10.1007/978-3-319-10100-2_6
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DOI: https://doi.org/10.1007/978-3-319-10100-2_6
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