Copper Sulfate Patina. In natural patination the major coloring agent in the film is basic copper sulfate Carbonate and chloride salts of copper may also be present in varying concentrations In seacoast locations chloride salts may form an essential part of the patina film The basic chloride salts of copper are not only fairly soluble but photosensitive as well.
Process Boil immersion (A) 15 min Boil immersion (A)+ (B) 10 min Immerse in boiling cupric sulfate solution about 15 min or until color well developed Remove to hot water while ammonium chloride is added to the cupric sulfate solution Then immerse about 10 min Remove and wash in hot water.
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The sulfate patina on the other hand is highly resistant to all forms of atmospheric corrosion once it has had an opportunity to form completely It thus significantly increases the durability and hence the service life of copper roofing and flashing.
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The patina plays a very crucial role on the surface of copper The final patina layer is mainly composed of sulfate the sulfate patina is highly resistant to corrosion and hence protects the underlying copper body from further weathering The more patina is formed the more durable the sulfate layer becomes reducing the rate of corrosion.
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This patina is typically the result of sulfur and oxygen from the air combining with the surface copper atoms Water intermixes the reaction and over time the surface develops a hydrated copper sulfate not unlike that of the mineral bronchantite Today the development of these green copper sulfate patinas has greatly diminished.
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Copper Sulfate Patina creates a brown finish as a hot patina on bronze brass and copper Applied cold this patina will develop a copper color on steel and a grey finish on zinc It does not need to be diluted before use Darkening Patina is most commonly used cold on bronze brass and copper to produce a beautiful brown finish.