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N.º 2 2005 pp. 3-12 |
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Article
Oils, paintings and chemistry
Maria Eduarda Machado de Araújo
Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade de Lisboa, 1749-016 Lisboa, Portugal
Abstract
In oil paintings artists use oils to apply pigments. These oils firstly are liquid and then solidify in a thin film. Many chemical reactions are involved in drying and also in the aging of these oils. Drying is a continuous process that begins with the oxidation of insaturated fatty acids from triglycerides to originate peroxides. These compounds suffer a cascade of reactions that lead to cross linking bonds between fatty acids residues, transforming the oil in a solid film. Identification of the film oil is possible using the palmitic/stearic ratio (P/S) by chromatographic (GC) and/or spectroscopic techniques. Sterol composition, phytosterols or cholesterol, determined by GC-MS or FTIR techniques, allows investigators to distinguish between oil painting and a temper one that used egg as the binding medium.
Keywords
Oils
Paintings
Drying
Ageing
Peroxides
Language
Portuguese
Original title
Óleos, pintura e química
DOI
Download
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Citation
Conservar Património | APA | Chicago | NP405 | ABNTConservar Património:
Araújo, M. E. M., 'Óleos, pintura e química', Conservar Património 2 (2005) 3-12, https://doi.org/10.14568/cp2_1.
APA:
Araújo, M. E. M. (2005). Óleos, pintura e química. Conservar Património, 2 3-12. DOI:10.14568/cp2_1.
Chicago:
Araújo, Maria Eduarda Machado de. 2005. "Óleos, pintura e química." Conservar Património 2:3-12. doi:10.14568/cp2_1.
NP405:
ARAÚJO, Maria Eduarda Machado de – Óleos, pintura e química. Conservar Património. [Em linha]. 2 (2005) 3-12 [Consult. ]. Disponível em WWW: <URL:https://doi.org/10.14568/cp2_1>. ISSN 21829942.
ABNT:
ARAÚJO, Maria Eduarda Machado de. Óleos, pintura e química. Conservar Património, Lisboa, v. 2, p. 3-12, 2005. Disponível em: <https://doi.org/10.14568/cp2_1>. Acesso em: .
History
Online: 2017-10-3
Publication: 2006-1-23
References
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6 Mills, J. S., 'The gas chromatographic examination of paint media. Part I. Fatty acid composition and identification of dried oil films', Studies in Conservation 11 (2) (1966) 92-106.
7 van den Berg, J.D. J.; van den Berg, K. J.; Boon, J. B.,'Identification of non-cross-linked compounds in methanolic extracts of cured and aged linseed oil-based paint films using gas chromatography-mass spectrometry', Journal of Chromatography A 950 (2002) 195-211.
8 Gimeno-Adelantano, J.V.; Mateo-Castro, R.; Domenech-Carbo, M. T.; Bosh-Reig, F.; A. Domenech-Carbo, A.; Casas-Cataán, M. J.; Osete-Cortina, L.,'Identification of lipid binders in paintings by gas chromatography. Influence of the pigments', Journal of Chromatography A 922 (2001) 385-390.
9 Colombini, M. P.; Modugno, F.; Giacomelli, M.; Francesconi, S., 'Characterisation of proteinaceous binders and drying oils in wall painting samples by gas chromatography-mass spectrometry', Journal of Chromatography A 846 (1999) 113-124.
10 Meilunas, R. J.; Bentsen, J. G.; Steinberg, A., 'Analysis of aged paint binders by FTIR spectroscopy, Studies in Conservation 35 (1) (1990) 33-51.
Stable url: https://doi.org/10.14568/cp2_1
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