Many people think that the nature of gold is very stable. In fact, gold is not as stable as everyone thinks. Gold will fade and rust will turn white. Xiaobian believes that many people do not understand these little common sense of gold. Why does this happen?
1. Why is gold whitish?
Nowadays, there are more and more cosmetics and daily necessities, and many unidentified factors may cause discoloration of gold. For example, the gold and silver jewelry worn by medical workers is most likely to change color due to the surrounding environment.
The trace amount of lead contained in cosmetics will react with gold and become white.
In addition, some people wear gold rings and platinum rings on the two adjacent fingers of the same hand. Because the fingers need to move frequently, it is easy to cause the two rings to rub against each other, resulting in gold. The jewelry is partially white.
2. Why does gold fade?
The 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 so on.
3. Why does gold rust?
Any metal exposed to the air will react with oxygen in the air, and the final result is the formation of bismuth oxide on the metal surface.
If you find that there is a change in the gloss when you wear gold jewelry and just bought it, it is actually caused by the long-lasting oxidation reaction, which is called "rusting."
Gold rust is not obvious because gold has a strong anaerobicity. From the metal activity sequence table, gold ranks last. Gold has thus been able to maintain a long-lasting brilliance, which is one of the reasons why people use gold as a jewellery material.
4. Why does gold turn black?
When silver and copper in gold jewellery come into contact, a chemical reaction occurs, producing silver chloride and copper sulphide, and exhibiting 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.
Comes with a small reminder of gold maintenance:
1, can be wiped with toothpaste or scrub with hot rice soup, but also restore luster.
2, gold is relatively soft, easy to deform, so do not pull necklaces and other accessories, so as not to deform.
3. 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.
4. 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, then remove them and wipe them dry.
5, salt and vinegar mixed into a cleaning agent, use it to wipe pure gold jewelry, can make a long time new.
6, protect the luster of gold jewelry, you can apply a thin layer of nail polish on the thin layer.
7. Rings with jewels Use a popsicle or a matchstick to roll a piece of cotton. After dampening in a mixture of toilet water and glycerin, scrub the frame of the gemstone and then polish the ring with a flannel. Do not use a blade to sharpen the object.
8, avoid direct contact with perfume, hair spray and other high-volatility substances, otherwise it will easily lead to fading of gold ornaments.
9. Remove the gold ornaments when swimming, so as to avoid chemical changes on the surface after encountering sea water or pool water.
10. When storing, wrap it in a velvet cloth and put it in the jewelry box to avoid mutual friction and damage.
11. The chemicals in the detergent will change the color of the gold, so you should take off the gold jewelry before cleaning.
12, jewelry in the case of mercury will produce a chemical reaction, white spots appear, as long as you wash under the alcohol lamp for a while, you can restore the original color.
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