Material for a History of Conservation |
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| Abstract: | AbstractThe non-saponifiable fractions of the principal drying oils have been examined by gas and thin-layer chromatography and found to be qualitatively similar though varying in the relative amounts of sterols present. In the case of aged paint films it has been found that these sterols have largely disappeared from unpigmented films and those containing light red and lead white as pigment, though they survive quite well in the presence of verdigris. Similarly cholesterol was not found to survive well in egg tempera films. Doubt is felt as to the value of such analyses as an approach to paint medium identification. |
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