This clay is primarily made of kaolin, a fine white clay.
Porcelain is regarded as the most refined of all ceramic wares .
Unearthed at Zhenzhou, Henan. This Zun was unearthed at a Shang dynasty tomb at Zhengzhou in 1955. It has a thin layer of green glaze on its surface , and is the earliest porcelain discovered in China so far. See Chinese art . Unearthed at Puyang, Henan.