1. When the silver cup is filled with more inert metal salts, it is likely to dissolve the silver and lead to heavy metal poisoning after entering the human body.

2. Silver will darken when exposed to air, and will turn yellow as time goes by, so some handicrafts used for viewing are usually packed in acrylic plastic. Filling water or making tea in a silver cup will speed up the oxidation of the silver liner.

3. Silver has strong thermal conductivity. For example, if you use a silver chopstick, one end touches hot water and the other end touches your hand. In one second, your fingers obviously feel hot, so there is a risk of burns during use.

Extended data:

As a practical type of silverware, the purity of silver needs to reach more than 99.9%, after all, it is indirectly in contact with our bodies. Therefore, it cannot contain other metal impurities.

Judging whether a sterling silver cup is genuine or not is not based on whether it has a patent number or which brand it belongs to. It depends on whether there is an appraisal certificate issued by an institution with appraisal qualification. As far as the sterling silver cups on the market are concerned, you must choose a guaranteed brand to avoid being cheated.