by POPSUGAR Home 1

This Hollywood Regency Vintage Metal Stool ($450) from Bond & Bowery has a turquoise-y green patina that's appropriate for its age, seeing as it was built in the 1940s. There's a common name for this sort of coating that forms when copper, brass, or bronze are exposed to air or seawater over a period of time. Do you know the word that describes this patina?