Patina
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Patina is a thin layer that variously forms on the surface of copper, brass, bronze, and similar metals and alloys, or certain stones and wooden furniture, or any similar acquired change of a surface
Copper roof on the Minneapolis City Hall, coated with patina
The Dresden Frauenkirche. The church was destroyed during the bombing of Dresden in 1945 and rebuilt from 1993 to 2005 with new material; the stones with the black patina are the parts that survived the firebombing from the original 18th-century church.
Pre-colonial copper coin formerly used in the Copper Belt (Democratic Republic of the Congo and Zambia). The external layer has been weathered by moisture and rain, leading to the oxidation of copper.
Copper weather vane with verdigris patina
Copper
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Copper is a chemical element; it has symbol Cu and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure co
Patina
…Patina ( pə-TEE-nə, or PAT-ih-nə) is a thin layer that variously forms on the surface of copper, brass, bronze, and similar metals and alloys (tarnish produced by oxidation or other chemical processes), or certain stones and wooden furniture (sheen…
Nat Copper
A copper disc (99.95% pure) made by continuous casting; etched to reveal crystallites
Unoxidized copper wire (left) and oxidized copper wire (right)
The East Tower of the Royal Observatory, Edinburgh; the original copper was installed in 1894 and the refurbished copper in 1994