White porcelain is actually made of clay, but its surface has a layer of glaze. After being heated at high temperature, it will release substances harmful to health. Purple casserole does not contain any chemical coating, and is rich in a variety of minerals and trace elements, which are very fragrant whether cooking soup or cooking.
However, due to the high price of high-quality purple sand, some black-hearted manufacturers will use the soil dyed with dyes as the raw material of the inner container, so the quality of purple casserole is not easy to grasp. If you buy inferior purple casserole, the harm can not be underestimated.