Verdigris
From Biocrawler, the free encyclopedia.
Verdigris is the common name for the chemical Cu(CH3COO)2. It commonly occurs by the action of acetic acid when copper, brass or bronze are weathered and exposed to air or seawater over a period of time. Its name comes from the Middle English vertegrez, from the Old French verte grez, an alteration of vert-de-Grice—verd (green), de (of), and Grice (Greece)—"green of Greece."
The vivid bluish-green color of verdigris makes it a very common pigment. Until the 19th century, verdigris was the most vibrant green pigment available. It is poisonous, and has also been used in medicine and as a fungicide.
