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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.



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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. frown.gif

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