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There is beauty detoxification effect on the human body, So it is the best choice for those who are allergic to metal.
Why does silver will be black ? It is a normal natural phenomenon to be black for accessories because that the sulfur and oxides in the air have a certain degree of corrosion. So there will be some tiny spots(Ag2S),and then they will spread into pieces for a long time and even become black. So all the silver ornament has some discoloration due to oxidation. But silver ornament is very easy to maintenance. Rub it with the soft cloth or clean it with silver wash water.
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