Before the glaze water is fired, it generally contains red lead, which is also commonly known as arsenic. After proper firing, red lead will be transformed into harmless lead chemicals, so qualified ceramic tableware is harmless to human body. However, some unqualified ceramic tableware in the market is due to insufficient baking temperature or improper processing by workers, which leads to excessive lead dissolution of ceramic products. When eating in such a bowl, lead may be leached by organic acids in food.
Extended data:
Ceramic tableware for daily use is generally painted with color patterns. If inferior pigments or pigments with high lead and cadmium content are used in processing, the baking process is not good, which may easily lead to excessive lead and cadmium dissolution. Long-term use of this tableware will lead and cadmium into the body with food.
Lead can exist in the blood for a long time, causing vascular smooth muscle spasm, ischemia of important organs such as liver, kidney and brain, cell damage, affecting the normal metabolism of nerve cells, and also having adverse effects on children's intellectual development. Kidney is the main target organ of cadmium injury. Accumulation in bones can lead to decreased immunity, joint deformation and pain, commonly known as "pain".