According to its coloring principle, ceramic tableware can be simply divided into two types: overglaze colored porcelain and underglaze colored porcelain. The so-called glazed ceramic tableware is made by coating the glaze with pigment, or directly coating the surface of porcelain blank with pigment, and then firing at low temperature. Due to the low firing temperature, color patterns can not enter the glaze. Under-glaze color ceramic tableware means that all pigments are coated on the porcelain blank, glazed and then fired at high temperature, and the pigments will be covered by glaze layer.
When buying ceramic tableware, be careful of this brightly colored glaze, because these glazes contain a lot of heavy metals.
These heavy metals, such as lead, chromium, mercury and even radioactive element radium, can make the glaze brighter, more uniform and more durable, but they are extremely harmful to human body. When tableware is used to hold food for a long time, especially foods with high organic acid content such as wine, fruit juice and vinegar, these heavy metals will dissolve out and enter the human body with the food, causing chronic heavy metal poisoning, which may seriously damage the liver and kidney function, and even.
Extended data:
When choosing ceramic tableware, please pay attention to the following items:
1, try to choose lead-free glazed ceramic tableware or plain white ceramic tableware;
2. If you must buy colored ceramic tableware, try to avoid the color or pattern on the inner wall of the dish;
3. Don't choose glazed ceramic tableware, choose underglaze color ceramic tableware, which will be relatively safe. When the underglaze tableware feels, the pattern has obvious concave-convex feeling and granular feeling, while the underglaze tableware is smooth and delicate.
4. In order to ensure your own safety, don't go to the street to buy tableware cheaply, but buy it from regular supermarkets and supermarkets;
5. The tableware bought home should be soaked in boiling water for 5 minutes or soaked in vinegar for 2-3 hours, which can remove some toxic and harmful substances and ensure safety.
People's Network-The more gorgeous ceramic tableware is, the more dangerous it is. Consumers should be careful of heavy metals exceeding the standard.
People's health network-imitation porcelain tableware is best to choose white.