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The green patina that forms naturally on copper and bronze, sometimes called verdigris, usually consists of varying mixtures of copper chlorides, sulfides, sulfates, and carbonates, depending upon environmental conditions such as sulfur-containing acid rain.
Green pigments are the materials used to create the green colors seen in painting and the other arts. Most come from minerals, particularly those containing compounds of copper . Green pigments reflect the green portions of the spectrum of visible light, and absorb the others.
Verdigris on The Spirit of Detroit. Verdigris is a naturally occurring protective layer on metals such as copper, brass, and bronze. In addition to be a desirable artistic effect, it has been used primarily as a pigment and now-outdated medicinal preparations. When burned, verdigris produces a green flame.
Tate glossary definition for patina: Usually refers to a distinct green or brown surface layer on bronze sculpture.
Patina refers to a distinctive green or brown surface layer that forms on bronze sculptures over time due to oxidation. The term originates from the Italian word ‘patinato’, meaning 'a shallow layer of deposit on the surface.'
For more than 20 years I have been recreating the look of ancient bronze on my sculpture and now in this video, I share exactly how to do this stunning finish on any paint-able surface. Included are supplies you will need and the recipe for creating a gorgeous green patina using acrylic paint.
Buildings in damp climates will develop patina layers faster than ones in dry areas. The facades of many buildings are made of copper, brass or bronze, for example. These will produce different colors after natural weathering. Copper takes on a natural green or blue-green patina. Bronze takes on a brown color. [3]
