Versão em português
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

eduaraujo@fc.ul.pt

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

10.14568/cp2_1

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Citation

Conservar Património | APA | Chicago | NP405 | ABNT

Conservar 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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2 van den Berg, J. D. J., Analytical chemical studies on traditional linseed oil plants, FOM-Institute for Atomic and Molecular Physics, Amsterdam (2002).

3 Solomons, G.; Fryhle, C., Organic Chemistry, 7.a edição,Wiley, New York (2000).

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5 Volhardt, K. P. C; Schore, N. E., Organic Chemistry, 2.a edição,W. H. Freeman and Co, New York (1987).

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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