Octagonal Ewer and Cover, 11th century, 8-9/16 x 6-5/16 x 5 in. (21.7 x 16.0 x 12.7 cm), Qingbai ware Porcelain with pale-blue glaze, China, 11th century, Qingbai (bluish-white) is an apt term for a thin, translucent glaze of a faint, bluish tone that deepens where it thickens or collects in intaglio designs. Qingbai porcelains are indigenous to southern China; Jiangxi province was the major source and it is likely that kilns in the vicinity of Jingde Zhen produced the greatest number and best quality.