First, the purchase of ceramic tea sets must choose a formal market, must not be cheap to buy inferior products without formal manufacturers. The state stipulates that the ceramic tea set should be soaked in 4% acetic acid. The amount of lead dissolved should not exceed 7 mg/L, and the dissolved amount of cadmium should not exceed 0.5 mg/L. At present, the products of regular manufacturers can basically meet this requirement.
Second, pay attention to the color of the tea set when buying, touch the surface of the tea set by hand to see if the inner wall is smooth.
Third, sniff with the nose to see if there is any smell.