First of all, the easiest way is to buy a silver necklace with a small handkerchief similar to glasses cloth. If you feel dirty, wipe it with this small handkerchief. This is a special kind of silver cloth. It doesn't matter if you lose it. It will be sold in a store that sells silver ornaments. Wipe the oxidized part with this handkerchief and wipe it repeatedly for a few minutes to see the effect. You need to put the silver ornaments in a dry place when maintaining them. Try not to get them wet. When taking a bath or going to a hot spring, you must take off your silver necklace or bracelet and put it in a designated place or box to prevent it from adhering to water and rapidly oxidizing. He can't touch other chemicals, especially sulfur and sulfide, which will produce black silver sulfide anyway.
If your silver necklace has been oxidized, you can wipe it with a silver cloth or gently wipe it with a soft toothbrush dipped in toothpaste. Be sure not to use too much force, because silver jewelry is also soft and easy to scratch. You can also use the cola we can get every day, put the silver necklace in, and take it out with water after half an hour. Professionally, you can wipe the surface with a towel dipped in vinegar, or you can remove oxidation. In fact, we just need to maintain the silverware we wear every day. If you want to remove black oxide, you'd better go to a jewelry store and let professionals do it, otherwise you may not grasp this boundary well, resulting in deformation or even damage of the bracelet or necklace.