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.


van den Berg, J. D. J., van den Berg, K.-J., & Boon, J. J. (1999). 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 (pp. 248–253).