Is Copper Turning Green A Chemical Change
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"Why does copper turn green?"
2003
I need to write a paper most a chemical reaction. Can you requite me any information about why copper turns green? What would the chemical reaction be? Or advice where to look?
Thanks,
Wanda K. [last name deleted for privacy by Editor]
student - Iowa City, Iowa
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2003
Copper turns green when it oxidizes. Copper (oxide) as found in nature is dark-green - ask a chemical science guy or bank check a textbook for the consummate reaction.
Doug Corbett
- SLC, Utah
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2003
I presume you are interested in the blue-light-green patina somewhen formed on copper in outdoor atmospheres. It's a rather complex, lengthy sequence as shown in the Copper Development Association's Weathering Chart: https://world wide web.copper.org/applications/architecture/weathering-chart.html [link no longer works]
Initially, bare Cu metal atoms react with air to form the pink oxide, cuprite, CuiiO, which has Cu+ane cations. This gradually oxidizes farther to the blackness oxide, tenorite, CuO, with Cu+2 ions. The black sulfide CuS also sometimes forms. In the presence of wet, the blackish layer slowly reacts with sulfur dioxide and carbon dioxide from the air to eventually grade the patina, which is a mixture of 3 minerals:
brochantite, a greenish, hydrated copper sulfate, Cu4Then4(OH)vi
malachite, the green, hydrated copper carbonate Cu2CO3(OH)3
azurite, the blueish, hydrated copper carbonate Cu3(CO3)2(OH)ii
In these compounds, copper atoms from the metal surface have been fully oxidized into Cu+2 (cupric) ions. The rate of patina formation and the proportion of the components depend upon humidity and the corporeality of air pollution. In European cities, where sulfur-containing coal has been burned for centuries, brochantite predominates on older copper roofs and statuary. In rural environments elsewhere, malachite may predominate. https://www.copper.org/applications/architecture/finishes-natural-weathering.html [link no longer works]
Do Net searches for copper patina, blue green patina, malachite, copper oxidation, etc.
Ken Vlach [dec]
- Goleta, California
Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thanks for your hard work which the finishing globe, and we at finishing.com, continue to benefit from.
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September fourteen, 2009
The word for this action is verdigris.
Tom Sowell
- Dallas, Texas
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January four, 2011
What material or liquid tin I spread onto copper sheeting to speed up the greening procedure?
Thank you
Agi Shani
- Haifa, Israel
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January 4, 2011
Hello, Agi.
Many different things will color copper, from proprietary patinating solutions to acid to ammonia to urine. We have numerous threads on that subject. Please use "patina on copper" in the search engine. Good luck!
Regards,
Ted Mooney , P.East.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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