Pottery tableware may be poisonous?

Pottery tableware may be poisonous? Before talking about this topic, I have to talk about the glaze process on the ceramic tableware production process. Because ordinary ceramics have a rough surface after firing, they are not tight, and there are many small holes inside which are easy to seep water and are not suitable for holding food. Therefore, the ceramics used for food and drink will be glazed to make the surface of the chinaware ceramic smooth and smooth. , Easy to clean. At first, the glaze was purely to increase the hardness and impermeability of the ceramic, just like a protective film similar to glass is formed on the surface of the ceramic, and the composition of ordinary glaze is only a mixture of quartz and kaolin in proportion, which is non-toxic. . Later, the ancients accidentally mixed minerals containing lead, cobalt, iron, radium and other elements in the glaze, which formed a color on the surface of the ceramic after firing, so the current glaze color was obtained. Since then, people want more beautiful and durable ceramics, so the application of glaze is popularized. From the above description, it can be seen that the ceramic itself is not toxic. The main source of toxins is the glaze attached to the ceramic, and the method of glazing determines whether the ceramic produced contains toxins. At present, there are three main ways of glazing: over-glaze, mid-glaze and under-glaze. A simple understanding is the different processes of the paint layer with heavy metal elements that make the glaze colored. It is not difficult to imagine, on-glaze Because the heavy metal paint layer is directly exposed on the surface of the glaze, it is easy to be poisoned by contact with food; while the in-glaze and under-glaze are blocked by the glaze, which is relatively safer. Among the heavy metal elements in the glaze, lead and cadmium are soluble in water and easily absorbed by the human body. Lead is a poison that can act on various systems and organs throughout the body, and the toxicity is lifelong, and serious can lead to lifelong disability. When cadmium enters the human body, it will accumulate in the kidneys and eventually cause uremia. It ranks seventh among the 275 environmental toxins listed by the US Centers for Disease Control and Prevention. Therefore, if overglaze ceramics are used to make edible ceramic white porcelin dinnerware, acidic foods will be more likely to cause heavy metal elements such as lead to precipitate and poison the human body. Generally, the richer the color, the higher the heavy metal content in the paint, which is more likely to cause acute heavy metal poisoning. So everyone must pay more attention when choosing ceramic white porcelin dinnerware.

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