Precautions for Tableware Purchase
The lead and cadmium content of the in-glaze, under-glaze and most of the colored glaze porcelain and white porcelain in the ceramic eating utensils is very low. In the design, excessive amount of pigments with high lead and cadmium content, or insufficient temperature and ventilation conditions during baking, can easily lead to excessive lead and cadmium elution. Some white porcelains are mainly uncolored bone ashes. Due to the use of lead-containing frit glaze, if the process conditions of the bone ashes are not strictly controlled during firing, the lead leaching rate is likely to exceed the standard.
In addition, the blue pigment in ceramic pigments has a high amount of lead elution. If the amount of lead in the product decoration is too large, it will easily cause the lead content of the product to exceed the standard. In order to reduce the influence of lead content in the product, special attention should be paid when choosing ceramic tableware: the decoration of food contact surfaces should be paid to utensils that hold food. For utensils containing acidic food, try to choose products with fewer decorative patterns on the surface. When purchasing, you should also pay attention to whether the color of the pattern is bright. If it is not bright, it may be that the temperature during the baking process has not met the requirements, and the amount of lead and cadmium in such products is often higher. Pay special attention to products that can be erased by hand. This product has a very high dissolution of lead and cadmium. For unreliable products, soak them in vinegar for a few hours. If there is a significant change in color, they should be discarded.
The misunderstanding of purchase
Products with leaching amounts of lead and cadmium are not safe. Products with leaching amounts of lead and cadmium are not unsafe. A small amount of lead and cadmium will enter the human body and be excreted through normal excretion. Only a certain amount will be deposited in the human body and cause heavy metal poisoning. All products that meet the requirements of national standards can generally be used safely.
Overglaze products are not safe. The view that "overglaze products are not safe" is wrong. As long as the production process of overglaze products is properly controlled, the amount of lead and cadmium leached out will not exceed the standard. However, in order to save costs, some small enterprises have too much bulk density during baking, and the temperature does not meet the requirements, and the speed is too fast. The lead and cadmium dissolution rate of their products is more likely to exceed the standard.
White porcelain must be absolutely safe. Generally speaking, white porcelain is safer. However, in order to lower the firing temperature of the glaze, some porcelains have lead flux added to the glaze, which may cause the potential for excessive lead dissolution.
The above information is provided by bowls manufacturer.