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The discoloration or fading of gold jewelry is closely related to the sweat of the human body. Human sweat contains chlorinated substances, lactic acid, urea ammonia, etc., which are chemically reacted with silver and copper in gold jewellery to produce silver chloride and copper sulphide, and exhibit a deep black chemical salt. This chemical salt often falls from the gold jewelry, contaminating the wearer's skin, leaving a very noticeable black stain on the skin.
Second, cosmetics have become one of the "characters" indispensable to people's lives. If it is applied to the skin of the gold jewelry wearing part, then it will undoubtedly provide opportunities for cosmetics containing chemical substances and gold jewelry that is most afraid of chemical attack, and the result can be imagined. Some cosmetics also contain some fine hard particles, which can form another type of dirt, thus consuming gold jewelry.
Regional environmental factors may also cause gold jewelry to lose its bright color. For example, in a dry area, the air contains more original fine dust, which will form a kind of “human body sandpaper†when it is contaminated with the human body. It can rub the gold jewelry into extremely fine debris and appear partial black stains. The talcum powder or moisturizer also contains similar particles, which will also eclipse gold jewelry as described above. This is often overlooked in our lives. Therefore, don't wear it when you sweat a lot, sleep, or make up. Do not wear when sweating, sleeping, or makeup.
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