Encaustic

The medium, technique or process of painting with molten wax (mostly beeswax), resin, and pigments that are fused after application into a continuous layer and fixed to a support with heat, and achieves a lustrous enamel appearance. The solvent for encaustic is also heat. Once applied to a surface, encaustic paint doesn't need to dry. Instead, it needs to cool. Because it cools in minutes, additional coats can be added almost immediately. Once its surface has cooled, encaustic paint presents a permanent finish, and yet the painting can be revised and reworked at any time — whether seconds later or years later. It is a particularly durable paint, because wax is waterproof and over time can retain all the freshness of a newly finished work. (Artlex.com)

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