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Sometimes customers come to me and ask why their gold jewelry suddenly changes color or has white spots, worrying that they might have bought a fake.
The fact is usually that these concerns are unnecessary. Under normal circumstances, as long as it is purchased from an ordinary gold shop, the quality of the gold jewelry is guaranteed. After some jewelry cleaning by some staff in a gold shop, the white spots on the gold disappear, and jewelry will be lit as new.
Why would this happen? How do Gold Jewelery Get White? Gold is one of nature's most stable metals, and it does not react with any oxide gas in the air at room temperature or with three large acids (sulfuric acid, nitric acid, hydrochloric acid) or weak acid. Only aqua regia (a mixture of hydrochloric acid and nitric acid) can corrode it. But mercury is an exception, it is very easy to react with gold and produce a white compound called amalgam. Therefore, the gold immediately becomes white immediately when gold jewelry is exposed to mercury. And because mercury is volatile, it can cause discoloration of gold even from a distance.
It can happen in the home because there are mercury or mercury type in many cleaners, cosmetics and skin care products. If the gold is exposed to these objects, it will likely change color, turn white, gray or dark. Many ladies are accustomed to using skin care products before they touch their jewelry, which causes the chemicals to contact the gold directly and cause discoloration of jewelry. In addition, perfume, hair spray, seawater, pool water and dirt caused by prolonged wear will make gold jewelry change its color or fade. This has nothing to do with the purity of the gold, and that does not mean that jewelry is a fake.
Gold jewelry should be kept away from direct exposure to the listed substances and should be cleaned regularly. And if the surface of gold jewelry has changed color, do not use a hard object or tool to eradicate the modified part. The right way is to use alcohol lamp or welding torch used in jewelry processing to heat the white part of the gold so that mercury can sublime out of amalgam and separate from gold. When the jewelry gets cold, brush it lightly with a toothbrush and then wipe it off and press it hard a few times with a soft cloth, after which the gold restores its color. But try not to do it with a lighter one, as jewelry becomes black easily for incomplete combustion of the gas. K gold and inlaid jewelry do not fit this method, they should be taken to the gold store to get other proper treatment. However, if consumers hesitate about the quality of their jewelry, they should go to the professional department and identify jewelry as soon as possible.