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Cold Blue question

Discussion in 'Gunsmithing and Repairs' started by briang2ad, Dec 12, 2006.

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  1. briang2ad

    briang2ad Member

    Sep 3, 2005
    Bluing problem:

    I have a CZ 75 which was finished as “glossy blue”. If you have seen one, it is a VERY dark black/blue on a very brightly polished surface. BUT – that surface has little ‘scratches’ in it that get there from the final sanding/polishing. This particular gun has probably been sitting in a drawer un-oiled for years with no care and only occasional handling – mechanically like new. Over time, the bluing has lightened considerably, but is still shiney. Those micro scratches have gotten a little rust in them, and this has lightened the whole finish evenly – in the metal. The only real surface “rust” you would normally notice on the backstrap. I intend to DARKEN the entire gun’s bluing with Oxpho-blue.

    My question is: which process do I use on the instructions? “Touch up” or “reblue”. In touch up, there is really NO metal prep, for it says that oil does not hinder the process. In reblue, the process has you clean the metal with alcohol – I guess because the gun is white – I don’t know(?) My main concern is it be EVEN with no blotches. Anyone do this? (Please only those with OB experience – I know it is good stuff).

  2. 45auto

    45auto Member

    Dec 30, 2002
    I've always cleaned the surface with a cleaner/degreaser first, from Birchwood Casey. Regardless of whether a reblue or touchup.
    Then applied the OB, creme, and rubbed it in with 0000 steel wool. Keep reapplying until the level of "black" was achieved.

    Can't say it will blend with your current finish though. Try an inconspicous part first, if you can. Perhaps under the grip panels to see how it looks over the blueing.
  3. Plink

    Plink Member

    Apr 5, 2006
    I have use Oxpho Blue a number of times for touchups and full reblues. It won't darken an existing finish as it only reacts with bare metal, and the blue oxide of your finish acts as a barrier to the metal. It will blue any bare metal scratches but they won't blend in all that well. I don't know of any cold blue that will evenly darken the existing finish, actually. Oxpho is the most durable cold blue I've ever found, but it has it's limitations.
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