Methyl and ethyl methacrylate polymers, although extensively used in industry, do not possess the solubility characteristics (low polarity) that would make them appropriate for use over traditional oil paintings and other organic-based museum objects that might be sensitive to polar solvents such as alcohols, ketones and esters. Poly(n-butyl methacrylate), offered as an artists' varnish in the late 1930's, did not become widely accepted in the war-disrupted decade that followed. Accordingly, early in 1951, our laboratory began a detailed study of the higher alkyl methacrylate polymers for potential use as picture varnishes ( 1 ). To be suitable for use in museum preservation and restoration practice, picture varnishes must have a number of defined characteristics: (a) they must not interact with the object in a detrimental way - they must not, for example, soften or dissolve an old painting; (b) they must be easily applied by brushing or spraying; (c) they must have
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