All right. The quality of teapot mainly depends on the surface. A good teapot has a rough feeling, so it must be fired with good purple sand. Xu's teapot is fired with purple sand, so the product is good, not only exquisite in workmanship, but also atmospheric, so it is very good. Zisha Pot is a unique handmade clay handicraft in China. Its production began in Zhengde period of Ming Dynasty, and the raw material was purple mud, which was produced in Dingshu Town, Yixing, Jiangsu Province.