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1. Reasons for silver jewelry turning black Silver jewelry turning black is a normal natural phenomenon, as sulfur and oxides in air and other natural media have a certain corrosive effect on silver. After wearing silver jewelry for a long time, the combination of sulfur and silver will form a black silver sulfide film on the surface of the silver jewelry, which begins to appear as some small spots. After the vulcanization phenomenon intensifies, it slowly spreads into pieces, forming what people usually call silver scale, turning black and affecting the surface gloss of the silver jewelry. People usually mistake it for fading. The chemical reaction equation is: 4Ag+H2S+O2=2Ag2S+2H2O How to clean silver jewelry after vulcanization? Squeeze a little toothpaste and add a little water to make a rich foam. Wipe it with a soft cloth until it is bright. Brush the gap with a soft bristle toothbrush, and then rinse it with water. For complex components and chains, they can be put into toothpaste water with foam and gently rubbed repeatedly, and then washed with clean water. When sulfurization is severe, professional silver washing water can be used for cleaning. Although silver washing water is claimed to be "non damaging to silver", it is still a chemical preparation, and it is recommended not to use it unless necessary. How to maintain silver jewelry on a daily basis? The best way to maintain silver jewelry is to wear it every day, because the body's oils and fats can make silver emit a warm and natural luster (of course, there are exceptions, some people's sweat itself contains ingredients that make silver turn black). When wearing, wipe the surface of the silver jewelry with a soft cloth or silver cloth every day to maintain its luster 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 surface from oxidizing and turning black due to contact with air. Note: For more information on silver jewelry, please search online.