How to judge whether ceramic tableware is poisonous?

How to judge whether ceramic white porcelin dinnerware is poisonous? How to judge whether a ceramic meal is toxic and non-toxic is mainly viewed from two aspects, one is ceramic material, and the other is firing. Ceramic materials are mainly blanks (mud), glazes (glazes), and decorative materials (paintings). Generally speaking, the clay of the green body is porcelain clay (mainly kaolin) and pottery clay. These two are completely assured. Generally, there is no additional chemical industry. They are natural clays and minerals, as long as the grades and qualities are different. The problem mainly lies in the glaze or paint material. The glaze forms a glaze similar to glass (vitrification) after high temperature. As long as it is a prescription raw ore, a small amount of chemical industry will not become the climate. Painting materials are more troublesome. The low-cost materials are all chemical materials, and color materials contain heavy metals (lead, mercury, etc.). Therefore, it is conceivable that the underglaze color is relatively more assured. The second is the firing problem. Whether the clay glaze paint is safe or not depends on the firing temperature. High temperature porcelain is better than medium temperature and low temperature. High temperature generally refers to 1280 degrees Celsius to 1350 degrees Celsius. Under calcination at such a temperature, generally harmful substances disappear or transform after oxidation and reduction atmospheres. In summary, high-temperature porcelain can almost be regarded as ok. If there is paint decoration, underglaze is better than overglaze. It is recommended that the glazed utensils should only be decorated or display fruits, and avoid heat or soaking in water and oil. The same applies to medium-temperature porcelain or some low-cost pottery. The color can be judged more than 60% of the medium temperature porcelain. The glazed vitrified layer of medium temperature porcelain is relatively thin. As long as a shallow layer of refraction can directly see the tire color, the glaze and paint used for medium temperature painting are different from the high temperature in terms of formula, and the effect is Similar to gouache paintings, the paintings are generally rough. This is not only due to the craftsmanship, but also depends on the quality of the fetus and the characteristics of the paint. Looking at the thickness, generally speaking, good high-temperature porcelain has a thinner fetus than medium-temperature porcelain. Because the firing temperature of medium-temperature porcelain white porcelin dinnerware is low, the degree of sintering is not high, and the texture of high-temperature porcelain is loose, in order to improve the impact resistance, the fetus will be relatively Thicker. Listening to the sound is more dependent on experience, flicking the utensil with your hand, the sound of the high-temperature porcelain white porcelin dinnerware becomes clearer and closer to the metal sound, and there is a sense of density in listening to the sound, while the sound of the medium-temperature porcelain is relatively dull, which is determined by the density.

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