In the process of making ceramic tableware, which links will have potential safety hazards

In the process of making ceramic tableware, which links will have potential safety hazards? 1. Drawing The drawing of ceramic white porcelin dinnerware is divided into over-glaze, mid-glaze, and under-glaze. The simple understanding is: Under-glaze (safe): first paint with colored materials on the porcelain, then hang the glaze and burn it in the kiln. More common in: blue and white, blue and white multicolored, monochromatic glazed porcelain tableware. In-glaze (relatively safe): Under the conditions of high temperature and fast firing, the ceramic tableware pigment sinks into the glaze when the glaze is melted, and is covered by the glaze layer after cooling. Because the pigment does not directly contact food, the amount of lead (cadmium) leached out is safer. More common in: blue and white glaze, red glaze color (suggest not to be used as food utensils): first firing white glazed porcelain, painting on the white glaze, and then firing in the kiln, the second firing temperature is higher than the first firing Low. More common in: famille rose, colorful, bucket color, enamel porcelain. It is better to be used for furnishing utensils. Nowadays, low-cost materials are basically chemical materials, and color materials contain heavy metals (lead, mercury, etc.). So whether the overglaze is safe can be imagined. Then there are some consumers who like utensils with gold rims. These golden rims or golden patterns are all made of pure gold gold water color agent printed in the floral paper, and then made by baking flowers. 2. Firing temperature The firing temperature of the on-glaze color only needs to be 600 to 900°C (not recommended as a edible vessel). If you really like it, you can use it as a melon or cold dish. The in-glaze color is burned at 1060-1250° (relatively safe), and the under-glaze color is fired at a high temperature of 1200-1400° in the kiln at a time (the safest).

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