NEW PICTURE VARNISHES

Abstract

Varnishes spend their lives spread out as thin films exposed to the air, which is an oxidizing environment. The energy for the chemical reaction leading to oxidation is most likely to come from the light shining on the picture. Thus deterioration of a varnish is mainly a matter of photochemical oxidation. Experience in the author's laboratory and that of R. L. Feller in America and the accumulating experience of industry seems to show that the most permanent materials at present available are polyvinyl acetate and certain of the acrylic resins. Some tentative comparisons of permanence for dammar, mastic, AW2, MS2, MS2A, polyvinyl acetate and iso-amyl methacrylate are given in Appendix I. As an example it is probable that polyvinyl acetate is at least 200 times as resistant to photochemical oxidation as dammar or mastic.

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