Burnt Umber is the calcined, or burnt, version of umber. In as little as 600°F, umber, a yellowish light brown, can turn into Burnt Umber, a rich red brown, and gets rid of the plasticity of umber. Burnt umber is commonly used as a stain in many clay bodies, slips, engobes, and glazes.
Information gathered from Digitalfire Ceramic Materials Database.
