Burnishing
Burnishing is a ceramic surface finishing technique in which the surface of clay is polished by rubbing it with a smooth tool before firing. This process compresses the clay particles and produces a smooth, often slightly glossy surface.
Burnishing is typically carried out when the clay is in a leather-hard or nearly dry state. Potters rub the surface with tools such as smooth stones, metal spoons, bone tools, or other hard objects. The pressure applied during the process aligns and compresses the clay particles, creating a reflective finish.
The technique does not involve glaze. Instead, the polished surface itself produces the visual effect after firing. Burnished pottery often displays a soft sheen and a smooth texture.
Burnishing may be used on its own or in combination with other decorative techniques such as carving, slip decoration, or firing effects. The technique has been used historically in many ceramic traditions around the world and can also appear in Japanese pottery, particularly in works that emphasize natural clay surfaces and minimal glazing.
Because the surface is compacted during burnishing, the resulting pottery may also have slightly improved resistance to liquids compared with untreated clay surfaces.
