 Perhaps owing to sharing its name with a mineral, turquoise is currently a more common term in English than other cyan-like colors.Verdigris is the common name for a green pigment obtained through the application of acetic acid to copper plates or the natural patina formed when copper, brass or bronze is weathered and exposed to air or seawater over a period of time.The name "verdigris" comes from the Middle English "vertegrez", from the Old French "verte grez", an alteration of "vert-de-Grèce" ("green of Greece").