1. Purple casserole: the inner container is made of high-quality natural purple sand, which is an iron-containing clayey siltstone and consists of mineral components such as hydromica, kaolin, Yingshi, mica flake and iron.

2. Casserole: Ceramic products made of raw materials that are difficult to transfer heat, such as seasonable, feldspar and clay.

Second, the characteristics are different.

1, purple sand casserole: higher thermal efficiency, purple sand liner, sanitary, non-toxic, easy to clean, avoid the intake of harmful metal ions, the stew is original and the nutrition is not lost.

2. Casserole: It has the characteristics of ventilation, adsorption, uniform heat transfer and slow heat dissipation. Casserole can transfer the external heat energy to the internal raw materials in a balanced and lasting way. A relatively balanced ambient temperature is conducive to the mutual penetration of water molecules and food, and can release the taste of food to the maximum extent.