EG-007 Terracotta EngobeCone 6 oxidation: Terracotta Engobe fires matte. Highly stable. Cone 10 reduction: Color darkens. Remains stable. Tips: Can be applied to wet clay, greenware or soft fired, cone 04 bisque. Engobes are often used for a variety of decorative techniques, such as sgraffito and majolica. Fires matte. Apply clear glaze to intensify color or for use on dinnerware. Engobes will impact glaze results when used as a base. Engobes are used to change the color of