As early as the Eastern Han Dynasty, production of pure, transparent, and luminous celadon began. The Yue, Wu, and Ou kilns in Zhejiang during the Jin Dynasty had already reached a considerable scale. In the Song Dynasty, as one of the five famous kilns at that time, the celadon tea sets produced by Longquan Ge Kiln in Zhejiang had reached its peak and were sold to various places. In the Tang Dynasty, the porcelain industry had become an independent department.