Yellow pigments in painting: characterisation and UV laser-induced modifications

Artistic yellow pigments, commonly employed from antiquity, were investigated by morphological, spectrophotometric and compositional analyses. Namely, scanning electron microscopy–energy dispersive X‐ray (SEM/EDX) characterisations and reflectance, attenuated total reflection–Fourier transform infra...

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Bibliographic Details
Published in:Journal of Raman spectroscopy 2009-11, Vol.40 (11), p.1664-1667
Main Authors: Acquaviva, S., Baraldi, P., D'Anna, E., De Giorgi, M. L., Della Patria, A., Giotta, L., Omarini, S., Piccolo, R.
Format: Article
Language:English
Subjects:
Binding
colour measurement
excimer laser-induced effects
Excimers
Lasers
Mathematical models
micro-Raman spectroscopy
Pigments
Raman spectroscopy
Scanning electron microscopy
spectrophotometry
Transformations
yellow pigments
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Summary:Artistic yellow pigments, commonly employed from antiquity, were investigated by morphological, spectrophotometric and compositional analyses. Namely, scanning electron microscopy–energy dispersive X‐ray (SEM/EDX) characterisations and reflectance, attenuated total reflection–Fourier transform infrared spectroscopy (ATR‐FTIR) and Raman spectroscopy were carried out on egg yolk tempera models to discriminate the pigments. The models were irradiated with excimer KrF (248 nm) laser at different working conditions, and the effects induced on colour were related to chemical and physical modifications through the same analyses, as a function of laser parameters. It came out that the effects on the pictorial layers are always related to the modifications of the binding medium and, in addition, the laser radiation induces dehydration and transformation of iron oxides in natural earths. Copyright © 2009 John Wiley & Sons, Ltd. Yellow inorganic pigments in egg yolk tempera were studied to assess the effects of UV‐pulsed‐laser irradiations. The effects on natural earths could be partially connected to the dehydration of goethite, along with its phase transition to hematite and/or magnetite. Moreover, for all the investigated pigments, laser irradiation induced photochemical modifications in the binding medium.
ISSN:0377-0486
1097-4555
DOI:10.1002/jrs.2316