Silver will be oxidized to black when it meets air, and there is oxygen in water. Whether silver is stained with water or not, it may be oxidized to black.

The blackening of silver ornaments is due to the chemical reaction between silver and sulfur in the air to form black silver sulfide. Therefore, silver jewelry should not be in contact with perfume, powder, balsam, sulfur soap, sweat and sour stand gas.

In order to restore the luster of silver jewelry, the following methods can be adopted:

Wipe it with cotton dipped in white vinegar, and the black silver sulfide will be dissolved in the ester acid, and the silver jewelry will be shiny again.

Wipe with alcohol or sodium carbonate, the effect is also very good.

Wash the surface of ornaments with detergent first, then with sodium thiosulfate solution (prepared by adding 20g of sodium thiosulfate to100g of water), and then with clean water.

Using tartaric acid 1 part, alum 1 part and salt1part, heating the mixture to boiling, and soaking the jewelry; /kloc-take it out after 0/0 minutes, wash it with water and then wipe it dry.

Washing with ammonia water and wiping with toothpaste on the flannel can also restore its original luster.

Proper maintenance is also very important.