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The reason why silver becomes black

time：2023-04-18 source：sznbone Views：

There is such a sentence "It is better to wear gold as silver". Many people prefer to wear silver jewelry. The price of silver jewelry is more affordable and the styles are very diverse. Therefore, it has always been loved by young people. In the case, what caused the silver ornaments to become black? In fact, silver and gold are the same, and they are both historic precious metals. Archaeologists have found "gold and silver errors" woven from gold and silver silk on the surface of the Spring and Autumn Period of the Spring and Autumn Period.

In the process of silver jewelry processing, in order to improve the hardness and gain the best molding effect, 7.5%of copper or other metals are usually added. Therefore, this silver jewelry is called standard silver internationally. %, This is why it is called 925 sterling silver, and there are high purity, that is, 990 sterling silver, so as the name suggests, the silver content is as high as 99%. The reason why the silver jewelry is wearing it for a long time is darkened because the silver jewelry is exposed to the air for a long time, and it will react with the hydrogen sulfide in the air to generate black silver sulfide. This is the main reason for the black head jewelry.

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The reason why silver becomes black