Chemists? NO picture but the experts shoud know.
I have a twenty year old Alligator key fob with brass snaps. There is a thick green scum around the snaps where it touches the leather. A friend has lincoln cents in her dad's blue folder with the same gren scum. What is the chemical name of the green scum? Copper___________? It comes off easily (if not too thick) with a toothpick or acetone. Thanks in advance!
PS How would a chemist write the reaction? XX + XX... = XX