1, buy tableware of pottery and porcelain must choose regular market, must not coddle cheap buy the inferior product that does not have formal manufacturer.National regulation, place tableware of pottery and porcelain in 4% acetic acid immerse, the leaching amount of lead must not be greater than 7 mg/l, the leaching amount of cadmium must not be greater than 0.5 mg/l.The product of normal manufacturer can accord with this requirement basically;

2. Pay attention to the color of tableware when buying. Touch the surface of tableware with your hands to see whether the inner wall is smooth and clean;

3, smell with the nose whether there is a bad smell;

4, do not buy the color of too bright ceramic tableware.To make color bright-coloured, manufacturer can add additive of a few heavy metal in glaze color, accordingly, the tableware with more bright-coloured color, heavy metal exceeds bid more easily;