French term meaning 'paste on paste'. A method of porcelain decoration in which a relief design is created on an unfired, unglazed body by applying successive layers of white slip (liquid clay) with a brush. The technique was first employed by the Chinese on so called Swatow wares in the 17th century, where white designs was painted on top of blue or brown glazed wares. Slip decoration is a similar method, but is just plain painting with wet clay, with no particular intention of creating a three dimensional effect. The technique should not be conflated with appliqué, where separately molded three dimensional figures would be applied to the unglazed body.