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How do I blacken copper?

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  • How do I blacken copper?

    I need to blacken a copper heat radiator for an electrical project. The end result must be a finish that is as dark as possible (black is ideal, but not a requirement), flat and non-reflective, and corrosion resistant. Does anyone have a solution?

    Thanks

  • #2
    Re: How do I blacken copper?

    VHT Flameproof Flat Black Paint - Caswell Inc. - High Temperature Coatings
    --
    Lance Caswell
    Caswell Inc
    http://www.caswellplating.com
    Need Support? Visit our online support section at http://support.caswellplating.com

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    • #3
      Re: How do I blacken copper?

      Is there any other way? Paint is a coating that surely has a higher thermal resistivity than if the surface were chemically altered, and I need to squeeze every bit of efficiency out of this radiator. If there is an alternative, I can try both to see which works best.

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      • #4
        Re: How do I blacken copper?

        I would try a Jewelry Supply store... Ask for Liver of Sulfer... Also called sulferated potash. I use it to turn sterling silver black. It only effects the copper in the silver. It should work fine on copper and doesn't cost very much.. I would first acid clean it. It stinks, so don't use it inside.............Fredo

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        • #5
          Re: How do I blacken copper?

          For blackening copper some chemical can be used. Such as potassium sulfate can be used. copper can be washed by acid water for blackening. Another way black oxide can be used it is the easiest process for blackening copper. Also electroplating method can be used for give copper a glace of other material. I think it will work.....

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          • #6
            Re: How do I blacken copper?

            Flemish Grey & Blackener
            For use on copper, brass and bronze. 15% to 20% by volume solutions produce black to blackish-brown US 10B (Oil Rubbed) finishes on copper and brass with immersions of 1 to 3 minutes. Diluted 5% to 10% by volume solutions produce lighter flemish and statuary bronzes with 1 to 3 minutes of immersion. Desirable underlying red tones revealed upon highlighting the brown tones.



            A311 Flemish Grey & Blackener 16 fl oz $22.47
            --
            Mike Caswell
            Caswell Inc
            http://www.caswellplating.com
            Need Support? Visit our online support section at http://support.caswellplating.com

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