Science Buddies: "Ask an Expert"

Can please tell me how long it will take for a coin to tarnish?

Thanks,
Van M

Hi Van
It really depends on the coin. If it is a copper coin, this link is pretty helpful-
http://resources.schoolscience.co.uk/CD ... 31pg3.html
If you tell us more information about your project, we might be able to help you more, thanks!