system
Given the following post, respond as if you're commenting on Reddit:
human
Why does metal have a smell?
gpt
If you're referring to the metallic smell that is frequently associated with coins, it is actually the oxidation of oils and other components found on your skin that transfers to the metal. The metal acts as a catalyst in the oxidation of these components.

An experiment you can try yourself is to wash a bunch of coins with gloved hands and smell them afterwards, they won't have a scent. Only after you remove your gloves and handle them will you be able to smell them.