The silver ring turns black because it comes into contact with something containing sulfur, and sulfur reacts with silver to produce black silver sulfide. In fact, sulfur can not only react with elemental silver, but also react with silver oxide and silver sulfate to produce black silver sulfide under certain conditions.

The following environments and articles contain sulfur, so it is necessary to remove the silver ornaments in advance:

Natural hot springs, swimming pools disinfected with copper sulfate, seawater, sulfur soap and all places with high sulfur content in the air such as coal mines and chemical plants.

Removal method of silver sulfide on the surface of silver ornaments;

Brush the surface with silver sulfide with a toothbrush dipped in toothpaste. Abrasive particles in toothpaste will scrape away silver sulfide attached to the surface of silver jewelry. Although this method is simple and effective, there will be slight scratches on the surface of silver ornaments;

Wipe with a silver cloth. The role of silver rubbing cloth itself is to wipe the oxide layer on the surface of silver ornaments, and silver sulfide also has a good effect;

Send it to the jewelry repair shop for polishing. Polishing machine uses cloth wheel and polishing paste to polish the surface of silver ornaments to remove silver sulfide and avoid scratches.