Porcelain used to be recognized as non-toxic tableware, but recently there have also been reports of poisoning from the use of porcelain tableware. It turns out that some beautiful coats (glazes) of porcelain tableware contain lead. If the temperature is not enough when firing porcelain or the glaze coating ingredients do not meet the standards, the tableware may contain more lead. When food comes into contact with tableware, lead may overflow the surface of glaze and mix with food. Therefore, those ceramic products with many thorns and spots on the surface, uneven glaze and even cracks are not suitable for tableware. In addition, most porcelain adhesives contain high levels of lead, so it is better not to use the repaired porcelain as tableware. When selecting porcelain tableware, you should gently tap on the porcelain with your forefinger. If you can make a crisp sound, it means that the porcelain embryo is delicate and well fired. If the tap sounds dumb, it means that the porcelain is damaged or the porcelain embryo is poor in quality.