1. First of all, pay attention to whether the lid is suitable. As we know, the lid of the ceramic water cup can make the water not cool so quickly.
2. listen to the sound, fingers click, if a clear, pleasant sound, then the porcelain is detailed and dense, if the voice hoarse, then for inferior porcelain, can not be bought.
3. when drinking water, the mouth will contact the cup wall, so the top of the outside of the cup wall, that is, where the mouth contact can not have patterns, and the inner wall had better not have patterns. Because these glazes contain trace amounts of lead, cadmium and other heavy metals, it is not easy to use for a long time. It is harmful to human body.
4. Touch the surface. See if it is smooth, see if there are cracks, holes, black spots, if it is as smooth as glass, the product is better.