Chemical changes in curing and ageing oil paints

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Reference J. D. J. van den Berg, K.-J. van den Berg and J. J. Boon: Chemical changes in curing and ageing oil paints In: 12th Triennial Meeting Lyon 29 August - 3 September 1999 ; Vol. 1, ICOM-CC ICOM Committee for Conservation, James, 1999. - pp. 248-253

A chemical and physical description is given of different processes in the development of an oil paint film: curing, maturing, and degradation. A transition from the initial polyester to an ionomeric system during the maturation process as a result of hydrolysis and metal carboxylate formation is proposed. Analytical results describe to what extent the transition from a polyester to a polyanionic ionomer has occurred for a number of aged paint samples. High degrees of hydrolysis (> 65%) are found in samples from 100-250-yearold paintings.