What was encaustic



References in ancient texts to binders other than encaustic are scarce: glue (Vitr. 7, 10, 2-4; Plin. H.N. 35, 7, 25), gum (Plin. H.N. 28, 17, 71, Vitr. 7, 10, 2), and egg tempera, (Plin. H.N. 35, 6, 26), although their use is not mentioned in relation to artistic purposes.