Classification and identification of organic binding media in artworks by means of Fourier transform infrared spectroscopy and principal component analysis
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Fourier transform infrared spectroscopy is a powerful analytical technique to study organic materials. However, in Cultural Heritage, since the sample under analysis is always a complicated matrix of several materials, data analysis performed through peak-by-peak comparisons of sample spectra with those of standard compounds is a tedious method that does not always provide good results. To overcome this problem, a chemometric model based on principal component analysis was developed to classify and identify organic binding media in artworks. The model allows the differentiation of five families of binders: drying oils, waxes, proteins, gums, and resins, taking into account the absorption bands in two characteristic spectral windows: C–H stretching and carbonyl band. This new methodology was applied in the characterization of binders in three kinds of artworks: papers of historical, archeological, and artistic value, easel paintings, and polychromed stone-based sculptures.
KeywordBinder FTIR Artwork PCA
A. Sarmiento is grateful to the Spanish Ministry of Education and Science for his FPU fellowship. This work was partially funded by the FP6 Project PAPERTECH (ref. INCO-CT-2004-509095) and by the Spanish MEC Project DILICO (ref. CTQ2005-09267-C02-01/PPQ). Authors would like to acknowledge Eleiz Museoa and Diputación Foral de Álava for letting them access to the real samples.
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