1. According to the understanding of the nature of gold, the main reason why gold turns white is that it meets mercury and produces a chemical reaction of amalgam, which produces a new chemical substance-gold amalgam, and the color of gold amalgam is just yellow and white, which is adsorbed on the surface of gold ornaments, resulting in the phenomenon of "gold turning white".
2. If there are gold and platinum rings on adjacent fingers, frequent finger movements will cause gold and platinum to rub against each other. Then the surface of the gold ring may be polished with platinum, which looks like gold has turned white.
The worst reason why gold turns white is to buy fake gold. When unscrupulous merchants pretend to be metals such as silver and plate a layer of gold on the surface of jewelry, consumers are deceived. However, after wearing this kind of jewelry for a period of time, due to friction and other reasons, the gold plating on the surface falls off, revealing the white metal inside.
Extended data:
If it turns white due to contact with substances such as mercury or silver, remember not to take it out directly with a knife or other hard objects. The correct method should be to burn the white spots or white spots with an alcohol lamp or a welding torch for jewelry processing, and wipe them with a fine flannel after cooling to restore the original golden luster of gold.
If you don't have alcohol lamps at home or you don't have enough experience, you'd better send the jewelry to a jewelry store for processing, so as to avoid using a lighter to handle it yourself, otherwise the jewelry that is not completely burned will easily turn black.