1. The commonly used ceramic bowls are made of clay after firing, plus a layer of glaze water. Before firing, the glaze water usually contains red pill, commonly known as "arsenic". After firing through a special process, red pill will be converted into harmless lead chemicals, so qualified ceramic bowls are harmless to the human body. And some unqualified ceramic bowls on the market, due to factors such as insufficient baking temperature or improper handling of workers, lead dissolution in ceramic bowls is too much. Eating with such ceramic bowls, lead may be leached out by organic acids in food.

2. The brighter the color of the ceramic bowl, the easier it is for heavy metals to exceed the standard. According to reports, in order to pursue bright colors, manufacturers will add some heavy metal additives to the glaze. Due to excessive heavy metals, the amount of lead and cadmium dissolved in ceramic tableware often exceeds the national standard by dozens of times. Long-term use of such tableware, lead and cadmium will enter 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, affect the normal metabolism of nerve cells, and play a negative role in the intellectual development of children. Kidney is the main organ of cadmium damage and accumulates in bones, which can lead to decreased immunity, joint deformation and pain.