Verdigris

[MikeKing]

Can anyone define verdigris, what it is, what it can do, can it be gotten rid of without damaging a coin?

 

[Oldtrader3]

Cu(OH)2 (Copper Acetate) and H2O. You might be able to dab some of it off with acetone and a Q-tip (depending on age and accumulation).

[truthteller]

Verdigris on copper is almost impossible to remove. The only thing that I have used that was capable of removing light to medium verdigris is a solution of water and nitric acid.

 

TRUTH

[gmarguli]

What it is:

 

1 a : a green or greenish blue poisonous pigment resulting from the action of acetic acid on copper and consisting of one or more basic copper acetates b : normal copper acetate Cu(C2H3O2)2·H2O

 

2 : a green or bluish deposit especially of copper carbonates formed on copper, brass, or bronze surfaces

 

It's not easy to remove.

[Mikey]

It's whale blubber.