Why does the gold jewelry change after a long time?

The discoloration or fading of gold jewelry is closely related to human sweat. 99%of human sweats are water, and about 1%are waste and harmful substances in the human body, such as: chloride, lactic acid, urea, urea ammonia, etc. After contacting the silver and copper in gold jewelry in gold jewelry, chemical reactions will produce silver chloride and copper sulfide, and show dark black chemical salt. This kind of chemical salt often falls from gold jewelry, polluting the wearer The skin leaves the skin with obvious black stains.
The cosmetics have become one of the indispensable "characters" in people's lives. If you apply it on the skin of the gold jewelry, it will undoubtedly provide opportunities for cosmetics containing chemicals and the golden jewelry that is most afraid of chemical erosion, and the results can be imagined. Some cosmetics also contain some fine hard particles, which can form another type of dirt, thereby wear gold jewelry. The regional environmental factors may also make gold jewelry lose their bright color. For example: dry areas, the air contains a lot of fine dust stains. After dyeing the human body, it will form a "human sandpaper". It can wear gold jewelry to erode extremely fine debris and local black stains. It is worth mentioning that the refreshing powder or moisturizing cream also contains similar particles, which will also make gold jewelry barely like the above.
The gold jewelry is not very delicate, but if you do not care carefully, it will also lose its initial gloss and charm. Generally speaking, the following points are to be careful:
1. The chemicals of cleaning essence will change the color of the gold, so you should take off the gold jewelry before doing cleaning.
2. Avoid contact with high volatile substances such as perfume and gum directly, otherwise it will easily cause gold decoration to fade.
3. When swimming, remove the gold ornaments to avoid chemical changes in the surface layer after encountering seawater or pool water.
gold jewelry maintenance
1: Avoid wearing precious metal jewelry to do housework or heavy work.
2: Avoid contact with mercury (tribute: such as body temperature meter, temperature meter, etc.), lead and other metals.
3: Avoid contact with chemicals such as cosmetics, perfumes, vinegar, juice, bleach, altering solution and lead, mercury and other elements.
4: The sweat of the human body will erode precious metal jewelry, so you should wear it with clean water and dry it with a dry towel in summer.
5: The precious metal jewelry with complicated craftsmanship, once damaged, is difficult to repair, and it is difficult to restore the original. Therefore, you must treat it carefully, especially when you write a snake bone chain, hardening chain, full of star chain, etc., you ca n’t restore it if you break it. Do n’t pull, fold, twist, drag, bath, swim, and sleep to avoid wearing.
6: Avoid stacking precious metal jewelry at the same time and rubbing each other, causing loss and affecting gloss.