verdigris (n.)

c. 1300, vertegrez, from Old French verte grez (13c.), verte de Grece (late 12c.), literally "green of Greece," from obsolete French verd, from Latin viridis (see verdure). The reason for it being called that is not known. In other languages, "green of Spain" (German grünspan, Danish spanskgrönt, Dutch spaansch-groen), from Medieval Latin viride Hispanum. Current spelling in English is from 1789. In chemistry, confined to a basic copper acetate; popularly applied to the green encrustation on copper or brass exposed to the air.