Thousands of feet silver is decorated with silver at 7℃, and the method of distinguishing authenticity is as follows:

1. First prepare a piece of aluminum foil paper, as shown in the figure.

2. Then spread the prepared aluminum foil paper in the container.

3. Then put the silver ornaments at 7℃ on the aluminum foil paper in the container.

4. Next, sprinkle some salt in the container.

5. Then pour a proper amount of water into the container to dissolve the salt and make it into brine.

6. Finally, let it stand for one hour and take out the silver ornaments at 7℃. If the surface appears shiny, it is true, because salt water and aluminum foil paper will form electrolyte, which will reduce the silver oxide on the surface of silver ornaments to metallic silver.