The United States purple casserole because it contains manganese dioxide discoloration, and manganese dioxide is toxic. But when cooking, I don't know if I can release those toxic elements, so the United States purple casserole is not necessarily toxic. And Jiuyang alabaster cooker, there is no this, the pot gall is with natural clay oil, so no poison, can be used without fear. But there is no real alabaster pot, but also natural and healthy clay pot to, can be used without fear.