This lead-glazed shallow dish with a straight rim is decorated in cobalt blue.The practice of using lead-glazed burial wares had already started during the Han dynasty (206 BCE-220 CE). This glaze technology further developed during the Tang dynasty into ‘sancai’ (‘three-colour’) glaze. It included colours such as cream, amber, brown and blue. The glaze tradition continued into the Ming period (1368-1644).