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Jewelry Display Cabinet Factory: Why does gold turn white or black or fade?

Source:凡路展柜厂    Author:凡路展柜厂    Visit:162    Pubtime:2018-11-23 17:31:39
Gold symbolizes wealth, and gold jewelry is favored by the Chinese people because of its beautiful meaning. However, many consumers find that after wearing gold jewelry for a period of time, the surface will turn white, which will lead to doubts about the color and true and false of gold. So why does gold turn white? Let's get to know it together.

    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.

    Why is gold faded?

    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.



    Why gold is rusty

    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.

    Why is gold blackened?

    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.

An introduction to why gold turns black or fade is here. For more information on the showcase, visit http://www.szfunroad.com.
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