Rubbing a surface with stone or a hard implement condensing the surface andcreating a reflective surface. In gilding, rubbing the clay and/gold surface with a hound's tooth, agate or hematite stone. Burnishing a water-gilt surface produces the most reflective gold surface possible. Burnishing is often employed selectively to enhance decoration by creating depth or accenting architectural aspects of the object. It is the properties of the rabbit skin glue that allow for burnishing. Other glues also have properties that enable burnishing like fish glue and gelatin.