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Is hot patination of copper using ferric nitrate allowed? If so what are the safety implications?

April 26, 2017allowed Copper ferric hot implications nitrate patination safety

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Is hot patination of copper using ferric nitrate allowed? If so what are the safety implications?

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A Yes, it has been used for many years. However the nitrous oxide fumes given off when absorbed into surrounding fabric create a fire hazard. Also energy is used in the heating process. Better to patinate cold or use prepatinated copper.