Varnishing Oil Paintings: Long‑Term Behavior of Spirit- and Oil‑Based Varnishes and Mediums
Guide to varnishing oil paintings: dammar vs mastic, spirit vs oleoresinous media, yellowing, reversibility, and best-practice application.
An oil that hardens to a tough, solid film after a period of exposure to air. The oil hardens through a chemical reaction in which the components crosslink by the action of oxygen. Drying oils are a key component of oil paint, oil painting mediums and some varnishes.
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