Why does gold turn white?
Gold has good physical properties, stable chemical properties, high degree of ductility and a small amount of rareness. Most people think that the nature of gold is very stable, but nowadays people are getting more and more cosmetics and daily chemical products. Some cosmetic products contain Traces of mercury, when you use cosmetics, you accidentally bump into gold jewelry, which will turn white and produce "gold and mercury containing gold."
In addition, if someone wears a gold ring on one finger of the same hand and a platinum ring on the adjacent finger, it is easy to cause the gold ring and the platinum ring to rub against each other due to the frequent movement of the finger. The surface of the gold jewelry is partially covered with platinum and white. In this case, it cannot be heated by the gasoline spray wheel to make it disappear, because the melting point of platinum is several hundred degrees higher than the melting point of gold. When the gold melts, the platinum is still “not movingâ€. For such a white gold jewellery, you can use an agate knife to plan the light, or you can use a thick cloth (such as canvas) to rub hard, so that the gold can be restored to light.
Why does gold turn black?
Some cosmetics or hair dyes contain trace amounts of lead, and gold is prone to blackening when exposed to lead. For the above two kinds of gold jewellery which has turned white and black, it can be heat treated with the gasoline sprayer for jewellery processing, because the melting point of mercury and lead is very low, and it will volatilize during the heat treatment of the spray wheel, so that the gold jewelry will be restored. face. Of course, it is best not to wear gold jewelry when applying cosmetics or dyeing hair to avoid future problems.
The discoloration or fading of gold jewelry is closely related to the sweat of the human body. 99% of human sweat is water, and about 1% is waste and harmful substances in the human body, such as chlorinated substances, lactic acid, urea ammonia and the like. When these materials come into contact with silver and copper in gold jewellery, they chemically react to produce silver chloride and copper sulphide, and exhibit a deep black chemical salt. These chemical salts often fall from gold jewelry, contaminating the wearer's skin, leaving a very noticeable black stain on the skin. On the skin where the jewelry is worn, it will give the color of the cosmetics containing chemical substances and the gold jewelry that is most afraid of chemical substances. Some cosmetics also contain some fine hard particles, which can form another type of dirt, thus wearing gold jewelry.
For example, gold and silver jewelry worn by medical workers is most likely to change color due to the surrounding environment. In the case of the above-mentioned fading, the consumer can go to the jewelry store to heat the gold jewellery. If it is indeed a thousand gold, it should be able to restore the original color.
Why is gold rusty?
Why do the gold ornaments, gold bars, and gold coins purchased in jewelry stores have yellow-brown spots? It is because in the process of making jewelry, the iron scraps left by the iron processing tools are formed by moisture, which is not a quality problem. It can be cleaned.
Why is gold faded?
Some cosmetics also contain some fine hard particles, which can form another type of dirt, thus consuming gold jewelry. The factors of the geographical environment may also make the gold jewelry lose its bright color. For example, in a dry area, the air contains more fine dust. When it is contaminated on the human body, it will form a kind of “human sandpaperâ€, which can rid the gold jewelry with extremely fine debris and local black stains. It is worth mentioning that talcum powder or body lotion also contains similar particles, which will also eclipse gold jewelry as mentioned above.
Aspects to pay attention to when maintaining gold
Gold jewelry is not very delicate, but without careful maintenance, it will lose its original luster and charm. In general, the following points are to be careful:
1. The chemicals of the detergent will change the color of the gold, so the jewelry should be used before cleaning.
2, avoid direct contact with high volatile substances such as perfume, hair gel, otherwise it will easily lead to fading of gold ornaments.
3, remove the gold ornaments when swimming, so as not to touch the sea water or pool water, the surface layer produces chemical changes.
4. When storing, wrap it in a velvet cloth and put it in the jewelry box to avoid mutual friction and damage.
5, gold is relatively soft, easy to deform, so do not pull necklaces and other accessories, so as not to deform.
6, pure gold jewelry will produce a chemical reaction when encountering mercury, white spots appear, as long as you wash under the alcohol lamp for a while, you can restore the original color.
7. After wearing, the gold ornaments often lose their luster due to the stains and dust. At this time, just put the gold ornaments in a neutral detergent and soak them in warm water and wash them.
8, to protect the luster of gold jewelry, you can apply a thin layer of nail polish on it.
9. If there is a black silver film on the surface, use 2 grams of salt, 7 grams of baking soda, 8 grams of bleaching powder, 60 ml of water, and make a “golden cleaning agentâ€. Put the gold jewelry in a bowl and pour it into the bowl. After 2 hours, remove the gold jewelry, rinse with water (preferably not hard water), bury it in wood chips, and then wipe it with a soft cloth.
10. Rings with jewels Roll a piece of cotton with a popsicle or matchstick. After dampening in a mixture of toilet water and glycerin, scrub the frame of the gemstone and then polish the ring with a flannel. Never use a sharp object like a blade to scrape.
11, salt and vinegar mixed into a cleaning agent, use it to wipe pure gold jewelry, gold jewelry can be used for a long time.
12, toothpaste wipe or scrub with hot rice soup, can also restore luster.
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