The white porcelain pot is made of clay with a glazed surface. After high temperature heating, it is likely to release substances harmful to health. The pot material of purple casserole is a coating without any chemical components, and it is also rich in various mineral trace elements beneficial to human body. It is not only delicious to make soup and cook, but also healthy. So generally speaking, purple casserole is better than white porcelain pot. It should be noted that purple casserole is expensive, and there are many fake and shoddy brand products on the market. If you buy these products to cook food, it will do some harm to human health.