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1. The cause of silver jewelry turning black The blackening of silver jewelry is a normal natural phenomenon, as sulfur and oxides in the air and other natural media have a certain corrosive effect on silver.When silver jewelry is worn for a long time, the sulfur and silver combine to form a black layer of sulfide silver on the surface of the jewelry, which initially appears as tiny spots. As the sulfide process intensifies, it gradually spreads into larger patches, forming what is commonly known as silver tarnish, which turns black and affects the surface gloss of the jewelry. People often mistakenly think it is discoloration. Its chemical reaction equation is: 4Ag+H2S+O2=2Ag2S+2H2O 2. How to clean silver jewelry after it has been oxidized? Squeeze out a little toothpaste, add a bit of water to create a rich lather, and wipe with a soft cloth until it's shiny. Use a soft-bristled toothbrush to clean the crevices, then rinse with water.For complex components and chains, you can gently rub them repeatedly in toothpaste water with foam, then rinse them with clean water.When the tarnishing is severe, it can be cleaned with professional silver cleaning solution.Although imported silver cleaning solution is claimed to be harmless to silver, it is a chemical agent after all, so it is recommended not to use it unless absolutely necessary. 3. How to maintain silver jewelry on a daily basis? The best way to maintain silver jewelry is to wear it every day, as the body's oils will give the silver a warm, natural shine (although there are exceptions, as some people's sweat contains substances that cause the silver to darken).When wearing, wipe the surface of the silver jewelry with a soft cloth or silver polishing cloth every day to maintain its shine and dryness.When not wearing, gently wipe the surface with a soft cloth to remove moisture and dirt, and place it in a sealed bag to prevent the silver jewelry from oxidizing and turning black due to contact with air. Note: For more information about silver jewelry, please search online.