Some articles on qingbai:

Chinaware - Types of Chinese Porcelain Wares - Qingbai Wares
... Qingbai wares (also called 'yingqing') were made at Jingdezhen and at many other southern kilns from the time of the Northern Song Dynasty until they were eclipsed in the 14th century ... Qingbai in Chinese literally means "clear blue-white" ... The qingbai glaze is a porcelain glaze, so-called because it was made using pottery stone ...