Tin-glazed pottery

Tin-glazed pottery is earthenware covered in lead glaze with added tin oxide^[1] which is white, shiny and opaque (see tin-glazing for the chemistry); usually this provides a background for brightly painted decoration. It has been important in Islamic and European pottery, but very little used in East Asia. The pottery body is usually made of red or buff-colored earthenware and the white glaze imitated Chinese porcelain. The decoration on tin-glazed pottery is usually applied to the unfired glaze surface by brush with metallic oxides, commonly cobalt oxide, copper oxide, iron oxide, manganese dioxide and antimony oxide. The makers of Italian tin-glazed pottery from the late Renaissance blended oxides to produce detailed and realistic polychrome paintings.

The earliest tin-glazed pottery appears to have been made in Iraq in the 9th century,^[2] the oldest fragments having been excavated during the First World War from the palace of Samarra about fifty miles north of Baghdad.^[3] From there it spread to Egypt, Persia and Spain before reaching Italy in mid-15th century, early Renaissance, Holland in the 16th century and England, France and other European countries shortly after.

The development of white, or near white, firing bodies in Europe from the late 18th century, such as creamware by Josiah Wedgwood, and increasingly cheap European porcelain and Chinese export porcelain, reduced the demand for tin-glaze Delftware, faience and majolica.

The rise in the cost of tin oxide during the First World War led to its partial substitution by zirconium compounds in the glaze.