Chlorinated substances, lactic acid, urea ammonia and other wastes and harmful substances discharged from human body will contact with silver and copper in gold jewelry to produce chemical reactions, resulting in dark black silver chloride and copper sulfide. This chemical salt sometimes falls from gold jewelry, and also pollutes the wearer's skin, leaving a very obvious black stain.

Coke is a carbonated drink with sweetness and caffeine. Chemical reaction with dirt on gold surface can remove dirt on gold surface.

Extended data:

Cleaning of gold ornaments;

1, in order to protect the luster of gold jewelry, you can coat it with a thin layer of nail polish.

2. If there is a black silver film on the surface, 2 grams of salt, 7 grams of baking soda, 8 grams of bleaching powder and 60 ml of water can be used to prepare a "gold cleaner". Put the gold jewelry in a bowl, pour the detergent, take it out after 2 hours, rinse it with clear water (preferably not hard water), bury it in sawdust to dry, and then wipe it with a soft cloth.

3. Ring with gemstones Roll a piece of cotton with popsicles or matchsticks, soak it in the mixed solution of toilet water and glycerin, scrub the border of the gem, and then polish the ring with flannel. Never scratch with sharp objects such as blades.

4, salt and vinegar mixed into a cleaning agent, use it to wipe pure gold jewelry, can make it durable.

5. Toothpaste wiping or scrubbing with hot rice soup can also restore luster.

China Master the common sense of maintenance when collecting jewelry.

Baidu encyclopedia-gold ornaments