Look at the mouth of the cup first: the inner container of the pure silver health cup is made of silver sheet by stretching machine. In the production process, the silver liner is directly embedded in the cup shell, while the silver-plated liner is only plated with a layer of silver by electroplating. On the mouth of the cup, the silver-plated one generally does not extend to the mouth of the cup, while the pure silver inner container is flush with the mouth of the cup.
Second, look at the surface smoothness: the surface smoothness of electroplated products is due to its technological performance. For example, silver rings and bracelets are electroplated for appearance. Pure silver health cup is used for drinking water. If electroplating process is adopted (electroplating is a very polluting process), it will do great harm to human body. Therefore, the surface of the silver-plated liner will be smooth, and there will be no obvious friction when touched by hand, while the pure silver liner is made by the integrated stretching process of silver sheets. Although it is polished in the later stage, it will still feel a little grinding.
Third, heat conduction method: because of the strong thermal conductivity of silver, we can pour a little boiling water into the bottom of the cup and then touch the silver-containing part of the cup mouth with our hands. If you feel the heat immediately, you can be sure that the silver purity of this cup is at least 80%, and it will not be a silver-plated product.
Fourth, the logo recognition method: Under normal circumstances, the real sterling silver cup will be marked with S999, or AG999, or Foot Silver 999, representing a thousand feet of silver, while the silver-plated cup will only be marked with a silver or no logo.
I hope it helps you. Thank you.