Encaustic painting, also known as hot wax painting, is an ancient technique. It involves using heated beeswax to which colored pigments are added. The liquid or paste is then applied to a surface—usually prepared wood. Other materials are often used such as canvas. The simplest encaustic can include damar resin, linseed oil, or other ingredients. Pure, powdered pigments can be used, though some mixtures use oil paints and ink.