When did celadon and white porcelain appear?

Primitive celadon (semi-porcelain pottery) appeared in Shang and Zhou Dynasties.

Porcelain and celadon systems have been successfully fired since the end of the Eastern Han Dynasty. It is found that celadon in the Three Kingdoms can reach the level of modern porcelain-making in the Southern and Northern Dynasties, and the temperature is about 1300.

It was generally believed that white porcelain belonged to the Sui Dynasty. Later research proved that the firing technology of Sui white porcelain had reached a certain level, and the Northern Qi Dynasty may be the beginning of this development process.