Vase 11th-12th century China Before the flowering of blue-and-white ware at this site in the fourteenth century, the kilns at Jingdezhen were producing thin porcelain covered with a pale bluish green glaze that is known as Qingbai ware (literally green-white ware). This vase is a rare example of early Qingbai pieces in which the glaze is very thin and very pale. In later pieces, the Qingbai glaze is the pale blue-green that is most commonly associated with the term celadon today.. Vase. China. 11th-12th century. Porcelain with celadon glaze (Jingdezhen Qingbai ware). Northern Song dynasty (960-1127). Ceramics