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19 . Why do the chains fade?

As you know, all the chains are made of metal, such as copper, iron, aluminum and so on.

We have to tell you that only high grade and expensive accessories made of pure platinum can not fade all over the world, all the accessories made of other ingredients can fade after using.

All metal products will fade after using. As we know, there is oxidation phenomenon as long as there is oxygen in the air. Oxidation phenomenon is unavoidable, we can only slow down the speed of oxidation by means of different methods, but there is no way restraining the occurrence of oxidation.

It is said that aluminum should be what is called non-oxidizable metal. Actually, aluminum is oxidizable as well.

The color of it’s oxide alumina is just the same as the color of aluminum, so we can not see the difference with the naked eye.

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