Scientifically speaking, the blackening of the silver bracelet is due to the chemical changes of silver ions and sulfur ions in the silver bracelet, thus generating silver sulfide on the silver surface. Because silver sulfide is grayish black, with the increase of silver sulfide, the surface color of silver gradually changes from white to yellow, then to gray, and finally to black. Therefore, it is normal for silver ornaments to turn black, because sulfur and oxides in natural media such as air have a certain corrosive effect on silver.
Under what circumstances will sulfur ions corrode silverware and turn black? In most cases, it is because people sweat, and sweat contains a lot of sulfur. When sweat comes into contact with silver ornaments through the body, it is easy to corrode silver ornaments. If children sweat more, the silver bracelets they wear will gradually turn black. So, it has nothing to do with health.
If the silver bracelet turns black, you can clean it with toothpaste, detergent or soap, and then clean it with cotton cloth. The best way to maintain silver jewelry is to wear it every day, because the oil of human body will make silver jewelry give off a warm and natural luster. If you don't wear it often, it's best to pack it in a closed bag to prevent the surface of silver jewelry from being oxidized and blackened by air.