Because the silver is darkened?
The cutleries, jewels and other silver objects are darkened with the step of the time, it is necessary to clean them so that they recover their previous aspect again.
The silver is a noble metal for that that not that he/she doesn't react with the other elements, it cannot be oxidized.
So much the gold, as the platinum and the silver is noble metals, for the little interaction that you/they have with the other substances, although that doesn't mean that they don't react.
The silver is not oxidized, he/she doesn't react with the oxygen of the air, but if it is darkened because he/she reacts with the sulfur that is in the at
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