Silver products are polluted by sulfur dioxide in the air, and silver sulfide is generated on the surface, which makes jewelry lose luster and turn black. So the cloth will turn black after wiping.

Silver is a relatively active precious metal, which easily reacts with sulfur or hydrogen sulfide in the air to generate black silver sulfide. This is also the reason why silver jewelry will turn black after use.

Long-term use of silver jewelry has little friction on the surface, and this phenomenon of blackening is more serious after being placed. The material of many silver ornaments is often silver-copper alloy, and this kind of silver ornaments should pay more attention to anticorrosion.

Extended data;

Maintenance methods of silver ornaments

1, often worn. Silver ornaments are often worn, not only to support people, but also to support people. People's oil and other substances can make silver ornaments bright and beautiful, and silver ornaments that are not worn are easy to turn yellow.

2. Seal when not in use. In many cases, the yellowing and blackening of silver ornaments are caused by oxidation, so be sure to put the silver ornaments in a closed small bag when not wearing them. There is no high-grade bag for keeping silver jewelry, just use ordinary plastic jewelry bags.

Don't take off your silver bracelet often. Silver bracelets are easy to deform regardless of high purity or low purity, and the deformed silver ornaments are difficult to restore to their original state, so they need to be sent to jewelry stores for correction.

Reference source; Baidu encyclopedia-silver jewelry