Purple clay teapot is a unique hand-made pottery handicraft in China. Its production originated in Zhengde period of Ming Dynasty. Its raw material is purple clay, and its origin is Dingshu Town, Yixing, Jiangsu Province. Purple sand is a kind of porous material with double pore structure. It has fine pores, high density and no leakage, which makes the tea taste more mellow and fragrant. Purple sand has a unique air permeability, tea juice is not easy to rot, and not easy to greasy fur. The heat transfer of purple sand is slow, and there is no hot feeling when using it; the heat preservation of tea making in winter is strong.
Purple clay is also known as five color soil. It is generally believed that there are purple mud, Duan mud, red mud, black mud and green mud. In fact, there are many colors of purple clay, no less than 100 kinds, mainly divided into purple mud, red mud and Duan mud. Different colors and textures can be blended from single mud and other purple clay or its associated minerals such as stone red and stone yellow. As long as it is pure purple clay, its chemical composition is similar, and its molecular structure is not too different, only the difference in color, plasticity and shrinkage.