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Gun Blue On Blades

Discussion in 'Fit & Finish' started by Boris Kleiner, Aug 8, 2017.

  1. Boris Kleiner

    Boris Kleiner New Member

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    G'day from Oz once again! A quick question for all you people. If using gun blue (more for effect than anything) can you limit the "flow" of the bluing agent (like limiting acid during etching) and if so, what would be the most effective method.

    Ta all

    Cheers
    Boris
     
  2. Mythtaken

    Mythtaken Staff Member CKM Staff

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    I've never tried bluing, but I would think using something like nail polish on areas you don't want blued would work as well as it does for etching.
     
  3. Boris Kleiner

    Boris Kleiner New Member

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    Ta mate, I'll give a small test piece a shot before blowing it out my blurter ;)

    Have a good one
    Boris
     
  4. Jewett

    Jewett New Member

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    you can brush it on with a very light coat, and blend with very fine steel wool.
    you can also put some in a spray bottle and mist it on, just remember that rinsing with cold water will stop the reaction.

    take it from me. the deeper you go with gun blue the more it smells like an egg fart.
     
  5. John Noon

    John Noon Well-Known Member

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    I quench with clay (ATP-641) or Condursal. Finished to 400 to 800 grit, before tempering I clean the blade real well and hand sand to get the finish back then wash real well so it is spotless.

    apply a coating of the bluing while blade is still warm after the temper cycle 200+F range.
    Buff the bluing , back into the furnace and apply another coating after the second temper.
    That particular knife did kitchen duty with no visible loss of bluing after a year.

    Another experiment performed on a steel punch the son-in-law made for sheet metal was to spray the steel down with a graphite lube straight from the furnace. It baked on real well but has not seen any use yet and certainly not food grade coating.
     
  6. Boris Kleiner

    Boris Kleiner New Member

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    Ta mate, will do as advised. Any input of using a barrier?
     
    Orrin likes this.
  7. Jewett

    Jewett New Member

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    This may sound dumb but if it were me... vaseline... it's a technique I use when doing multiple coats of different colours of paint on props to create weathering.

    Apply to the blade. Spray on gun blue. Rinse well with water and wipe away the vaseline.

    I've gun blued blades but not like how I described above. Done lots of prop helmets though!
     
  8. John Noon

    John Noon Well-Known Member

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    depending on temperature of application Vaseline like mentioned above or clear nail polish can be used. The nail polish can also be used as a resist when etching a blade
     
  9. Boris Kleiner

    Boris Kleiner New Member

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    I'll give it a whirl on a test bit of steel. No harm in learning something. Ta mate!
    I'll give it a test and see what happens, ta mate for th info!
     

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