Decoration thumb|upright|Song dynasty celadon porcelain with a fenghuang spout, 10th century, China Porcelain often receives underglaze decoration using pigments that include cobalt oxide and copper, or overglaze enamels, allowing a wider range of colours. Like many earlier wares, modern porcelains are often biscuit-fired at around , coated with glaze and then sent for a second glaze-firing at a temperature of about or greater. Another early method is "once-fired", where the glaze is applied to the unfired body and the two fired together in a single operation.
Decoration thumb|upright|Song dynasty celadon porcelain with a fenghuang spout, 10th century, China Porcelain often receives underglaze decoration using pigments that include cobalt oxide and copper or overglaze enamels, allowing a wider range of colours. Like many earlier wares modern porcelains are often biscuit-fired at around , coated with glaze and then sent for a second glaze-firing at a temperature of about or greater. Another early method is "once-fired" where the glaze is applied to the unfired body and the two fired together in a single operation.