Why do penneys turn green.
So do girls when someone prettier walks into the room ;)
The copper oxidizes.
True copper naturally oxidizes.
The copper oxidizes.Did you know that the Statue of Liberty used to be brown like the penny but it turned green?
Cause there magical :o :D
Pennies are made of copper and copper naturally oxidizes.
It just does that
The copper is eventually exposed to oxygen, I think.