Urn, Green Crackle glaze

The term 'celadon ware', also known as green ware, refers to a type of ceramic with a soft grey-green-coloured glaze. The effect is achieved through applying an iron-rich liquefied clay 'slip' to the ceramic before it is fired in a kiln.

A type of ceramic glaze that is intentionally crazed. Crazing is a crack pattern caused by thermal expansion mismatch between body and glaze. After the glaze solidifies (as the kiln cools) it shrinks more than the body. ... Crackle glazes are typically found on ware fired at low temperatures.