Encaustic

"From the ancient Greek enkaustikos, means" to heat" or "to burn."  Heat is used at every stage of encaustic painting.  The medium consists of beeswax melted with a small amount of resin to impart hardness; it becomes paint when pigment is added to the molten wax.  Painting requires the artist to work quickly, for the wax begins to harden the moment it leaves its heat source." - Mattera, Joanne. The Art of Encaustic Painting. New York: Watson-Guptill Publications, 2001.