What are the methods of making green glaze and black glaze?

During the 300-odd years from the Three Kingdoms period to the Southern Dynasties, porcelain-making technology developed rapidly. Local resources can be widely used as raw materials for porcelain making, and porcelain clay with low iron content can also be used to make black porcelain and celadon.

During this period, lime glaze was mainly used in various kilns, and the green glaze of Yueyao kiln contained about 18% calcium oxide. Because people began to realize the influence of iron content on the color rendering effect, they mastered the preparation of green glaze and black glaze.