Why does a pile of coins left alone for long periods of time get that “icky” dirty feeling and grime to them?
In: Chemistry
It’s called “corrosion”. Basically the metal on the coins react with the air and with the humidity of the air, creating ions. That layer of ions will protect the rest of the coin and that’s why the texture of the coins change.
For example, the Statue of Liberty is made out of copper, which has a dark brown colour, but the Statue of Liberty is kinda green. That is a layer of oxided copper, and it prevents the rest of the copper from vanishing due to corrosion.
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