Ceramic is a hard material formed by a series of physical and chemical reactions of clay raw materials, inert raw materials and flux raw materials after proper proportioning, pulverization, molding and high-temperature roasting. More common are: ceramic tea sets, ceramic plates, ceramic bowls, and a variety of ceramic living utensils. The multi-expression ceramic multi-functional spice jar is a kind of composite material which is coated with one or several layers of enamel on the metal surface, and is sintered and physically and chemically reacted to form a composite material. The biggest benefit of doing so is corrosion resistance. More common examples are: enamel wok, enamel washbasin, etc. Modern enamel pot emulates enamel cups in the 1950s and 1960s.
How to distinguish between the two? First of all, enamel is coated on the metal surface with a layer of ceramic glaze and fired at a high temperature; enamel is only one layer on the metal surface, and the enamel industry requires good suspensibility. Once again, ceramics, which are mainly coated with a layer of ceramic glaze on ceramic bodies, are fired at high temperatures. The ceramic industry requires good plasticity, moldability, and whiteness. The refractory materials require high refractoriness. Therefore, chemically, the composition of ceramics is not much different from the composition of rocks.
Therefore, it is concluded that these materials do not have any chemical materials and are almost harmless to the human body.