Evaluation of MidIR fibre optic reflectance: Detection limit, reproducibility and binary mixture discrimination

Sessa, Clarimma; Bagán, H.; Garcı́a, J.F.

doi:10.1016/j.saa.2013.06.088

Cited by 8 publications

(1 citation statement)

References 25 publications

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“…246 A reection mid-IR spectroscopy study of twelve metal-oxalate complexes, of interest in art conservation as alteration compounds, was performed by Monico et al 247 and then applied in situ to discriminate among different oxalates on thirteen polychrome artworks. Sessa et al 248 have evaluated the capabilities of mid-IR reectance (MidIR-FORS) for the analysis of artwork materials in terms of the detection limit, reproducibility and mixture characterization in oil easel painting, concluding that the detection limits established are relatively high for artistic objects while a totally non-invasive procedure has been developed by Aceto et al 249 for the differentiation of natural and synthetic ultramarine blue pigments on This journal is © The Royal Society of Chemistry 2015 the basis of a collection of UV-visible spectra in diffuse reectance mode (250-900 nm FORS analysis), followed by a chemometric treatment of the data using unsupervised pattern recognition methods. The use of UV and visible diffuse reectance spectrophotometry with optical bers (FORS) has also been proposed by Aceto et al for the in situ non-invasive iden-tication of several colorants used by ancient illuminators, causing no damage or mechanical stress to the artworks subjected to analyses.…”

Section: Portable Instrumentationmentioning

confidence: 99%

Analytical chemistry in the field of cultural heritage

Madariaga

2015

Anal. Methods

125

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Section: Portable Instrumentationmentioning

confidence: 99%

Analytical chemistry in the field of cultural heritage

Madariaga

2015

Anal. Methods

125

View full text Add to dashboard Cite

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Influence of composition and roughness on the pigment mapping of paintings using mid-infrared fiberoptics reflectance spectroscopy (mid-IR FORS) and multivariate calibration

2014

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Mid-infrared fiberoptics reflectance spectroscopy (mid-IR FORS) is a very interesting technique for artwork characterization purposes. However, the fact that the spectra obtained are a mixture of surface (specular) and volume (diffuse) reflection is a significant drawback. The physical and chemical features of the artwork surface may produce distortions in the spectra that hinder comparison with reference databases acquired in transmission mode. Several studies attempted to understand the influence of the different variables and propose procedures to improve the interpretation of the spectra. This article is focused on the application of mid-IR FORS and multivariate calibration to the analysis of easel paintings. The objectives are the evaluation of the influence of the surface roughness on the spectra, the influence of the matrix composition for the classification of unknown spectra, and the capability of obtaining pigment composition mappings. A first evaluation of a fast procedure for spectra management and pigment discrimination is discussed. The results demonstrate the capability of multivariate methods, principal component analysis (PCA), and partial least squares discrimination analysis (PLS-DA), to model the distortions of the reflectance spectra and to delimitate and discriminate areas of uniform composition. The roughness of the painting surface is found to be an important factor affecting the shape and relative intensity of the spectra. A mapping of the major pigments of a painting is possible using mid-IR FORS and PLS-DA when the calibration set is a palette that includes the potential pigments present in the artwork mixed with the appropriate binder and that shows the different paint textures.

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