Because in order to ensure the good combination of pigments and ceramic tires, ceramics are coated with some cosolvents. The cosolvents contain a certain amount of heavy metals such as lead and cadmium, which are easy to contact with food and gradually move into food and enter the human body through food.
Moreover, the longer the ceramic tableware holds acidic food or liquid and the higher the temperature, the easier it is to dissolve heavy metals.
Don't pay too much attention to patterns when choosing ceramic tableware, especially don't use tableware with painted inner walls. The newly bought tableware can be soaked in vinegar for 2~3 hours to dissolve the harmful substances in the glaze. In addition, painted porcelain should never be heated in the microwave oven.
Extended data:
Hidden trouble of ceramic tableware
Ceramic tableware has become the first choice for most families to buy tableware because of its diverse shapes, exquisite smoothness, bright colors and easy cleaning. However, the colored glaze on the ceramic surface may become a health killer. Lead, mercury, radium, cadmium and other elements in colored glaze are harmful to health. Radioactive element radium can kill white blood cells.
Cadmium, lead and mercury are all heavy metals. Cadmium and lead can cause liver or other visceral poisoning, and mercury can cause liver and kidney sclerosis. When unqualified ceramic products are used, these harmful substances will dissolve out and enter the human body with food, which will cause chronic poisoning over time. At the same time, we should also pay attention to the clay for making ceramics. Inferior clay contains more microorganisms and harmful substances, even if it is not glazed, it will endanger human health.
Therefore, the specifications and quality of products are particularly important. Standard colored glaze ceramics are basically harmless to human body, while colorless ceramic tableware that looks clean may pose a hidden danger to health.
Xinhuanet-Does the bowl crack affect health? These little knowledge of selecting ceramic tableware should be mastered.
Baidu encyclopedia-ceramic tableware