R. L. Feller, Catherine W. Bailie, Solubility of Aged Coatings Based on Dammar, Mastic, and Resin AW-2, Bulletin of the American Group. International Institute for Conservation of Historic and Artistic Works, Vol. 12, No. 2 (Apr., 1972), pp. 72-81
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Feller et al. (1972) studied this question.