Gold jewelry contains gold. When gold meets mercury, it will react with each other to produce "golden mercury agent", which means "golden mercury contains gold" and its color is white.

1. Gold jewelry is put in the drawer at will. When you meet mercury, you will immediately form a large area of white spots.

There are many kinds and brands of cosmetics now. Some cosmetics contain trace amounts of mercury. If you accidentally touch gold ornaments when using cosmetics, it will turn white here.

3. If worn together with platinum and silver ornaments, their surfaces will also produce white spots after long-term friction.

Extended data

Treatment method of gold discoloration

1. For the gold jewelry that has turned white, it can be heated by gasoline spray wheel, because the melting point of mercury is very low, and it will volatilize due to the heating treatment of spray wheel, so that the gold jewelry can be restored to its original appearance.

2. Roll a piece of cotton stained with the mixture of toilet water and glycerin with popsicle or matchstick, scrub the gem and its border, and wipe it with flannel. Never scratch with sharp objects such as blades.

3. Salt and vinegar are mixed into a cleaning agent, which can be used to wipe pure gold jewelry, making it durable.

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

5. It can be scrubbed with ammonia water.

References:

Baidu Encyclopedia: Gold