A bright bluish-green encrustation or patina formed on copper or brass by atmospheric oxidation, consisting of basic copper carbonate
is a green or bluish deposit, usually of copper carbonates, that forms on copper, brass, or bronze surfaces.
a green or bluish deposit formed on copper, brass, or bronze surfaces.
a green or bluish deposit esp of copper carbonates formed on copper, brass, or bronze surfaces also VERDITER [n -ES] / to coat with verdigris [v -ED,-ING, -ES]