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how'd you force a patina?

Discussion in 'Non-Firearm Weapons' started by DNS, Apr 28, 2013.

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  1. DNS

    DNS Member

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    Using my new Opinel Carbon 12 tonight and its starting to pick up a little patina from onions, papaya and tomatoes. I got one hot spot from a standing drop of tomato juice it looks like. I might try some vinegar or mustard; which one though...

    Suggestions on forcing some more?

    Btw, it was cutting tomatoes darn near paper thin. :cool:
     
  2. Deltaboy1984

    Deltaboy1984 Member

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    Mustard or Lemon juice.
     
  3. JShirley

    JShirley Administrator Staff Member

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    I would probably use mustard to make an interesting pattern.
     
  4. hso

    hso Moderator Staff Member

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    Blot with mustard and rinse after 5 hours and check the appearance.
    Use 0000 steel wool on the blade to remove any weak patina and rinse thoroughly. Dry the blade and reapply mustard in blobs to any weak areas of patina. After 5 hrs. rinse and wool again.
    Reapply more mustard and repeat the process a 3rd time and then a 4th. You'll reach a point of diminishing return on the effort (and you'll get bored by it) so going for a 5th or 6th or... will be a greater waste of time.
     
  5. Sam Cade

    Sam Cade Member

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    Soaking a towel (paper or otherwise) in vinegar and then wrapping the blade is a good way to get a purty pattern.



    This is a Hyde 510, wrapped overnight in a shop towel.

    Done by my 7 year old. Scales too. :)
     

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    Last edited: Apr 28, 2013
  6. P.B.Walsh

    P.B.Walsh Member

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    Is patina purely cosmetical or does it have a practical use?
     
  7. Sam Cade

    Sam Cade Member

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    If you give a good long soak and have a thick even patina (an oxide coating) it will act as a slightly protective layer against corrosion.

    ...the primary function is to keep oneself from looking like a noob.:D
     
  8. P.B.Walsh

    P.B.Walsh Member

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    Cool, I'll have to try it out on the next one I make!
     
  9. Fiv3r

    Fiv3r Member

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    Unless you've got a specific pattern in mind, just using a carbon blade will create an interesting and unique patina. I just used my brand new Fiddleback Hiking Buddy to cut up a dozen lemons for lemonade and quartered some spare ribs. Went from shiny and bright to a slight dull gray. Looks great:)

    I have made several swirled patterns by wrapping a blade in a muriatic acid soaked towel, rinsed, buffed, and repeated several times before neutralizing the acid with sodium bicarb, finding, drying, and giving a final oil. Really deep, dark, etch.
     
  10. HiWayMan

    HiWayMan Member

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    I like to microwave coke so it is about 120*-150*F. Suspend the blade in that for a while. Heating it seems to make it react better.
     
  11. mdauben

    mdauben Member

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    I don't worry about "forcing" a patina on carbon steel blades. I just use them for slicing fruits and vegetables and they develop one all on their own. ;)
     
  12. Piraticalbob

    Piraticalbob Member

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    +1. Forcing a patina is like buying pre-ripped jeans. Marks you as a poseur.
     
  13. Sol

    Sol Member

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    Liver of sulphur
     
  14. Bartholomew Roberts

    Bartholomew Roberts Moderator Emeritus

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    I left a carbon steel Mora sitting in a glass of grapefruit juice overnight. This gave it a nice even charcoal grey patina; but it wasn't very deep or very useful as a protective coating. It is now a mix of use patina (various spots from cutting things, rust) shinier spots from cutting fibrous things/having light surface rust cleaned off, and the original charcoal grey. I mainly use it as my gardening knife, some of the plants I cut with it etch the blade and apparently our soil is slightly acid since it will leave marks on the blade if not immediately cleaned off.
     
  15. Sam Cade

    Sam Cade Member

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    A nice long vinegar soak can also useful to get a look at the heat treat and remove surface rust.

    I plunked this wee axe into a bath last night to illustrate:
     

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  16. Deltaboy1984

    Deltaboy1984 Member

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    Looks good Sam.
     
  17. Sam Cade

    Sam Cade Member

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    Would you believe I found that while cleaning out a sinkhole full of garbage?

    The bit is haaaaaaard. It will skate a file like Johnny Weir.:D

    weir.jpg
     
  18. mgmorden

    mgmorden Member

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    I'll agree. Some nice wear can look good on something, but to me its only good if the item has "earned" that wear.
     
  19. Valkman

    Valkman Member

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    I agree in that I've always let it develop naturally - I like the look of doing it that way.
     
  20. 25cschaefer

    25cschaefer Member

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    For steel, hang in a box above a bowl of bleach, observe often.
    For brass, hang in a box above a bowl of ammonia.

    DO NOT PATINA BRASS AND STEEL AT THE SAME TIME!

    Depending on the size of the project, a foot locker on end works well.

    The problem with liquids and pastes is that they can look splotchy and it is easy to tell. Vapors patina evenly and look authentic.
     
  21. conw

    conw Member

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    I disagree about forcing patinas being lame. I love wearing my Levis 501s to death and that's half the fun but when it comes to knives in my experience a patina that is forced can help prevent light rust.

    I use my sodbuster Jr for food prep a lot and the occasional (inevitable) light rust gets cleaned off but without the deep, relatively even patina it seemed harder to clean off, as if the rust penetrated farther.
     
    Last edited: Apr 30, 2013
  22. Zeke/PA

    Zeke/PA Member

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    I like to "patina" carbon steel blades and French's yellow mustard is my choice.
    I wipe the blade with Acetone to remove any oil/fingerprints, coat the blade with mustard and let set 15-20 minutes, Rince in VERY hot water,dry and repeat the process 3 or 4 times.
     
  23. DNS

    DNS Member

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    Muratic acid you say...

    I use caustic soda at work.
    Sounds like I found something new to do tonight.:cool:
     
  24. bolthead

    bolthead Member

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    I use rust remover (naval jelly whatever) and a little bit of zinc added. For zinc I use either scraps of plated steel or hot dipped nails. You dont need a lot of zinc. The mix works fast but I do several reps with rinsing in water in between. Sorta like cold Parkerizing. Very durable finish and works fast so I watch it closely not to overdo it
     
  25. whetrock

    whetrock Member

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    On my smaller, traditional pocket knives, I just fill a cup with vinegar to the point it leaves nearly the whole blade submerged, and let it set overnight. The result is a blacker than night patina, that'll ward off rust like crazy. I've found the patina can "crawl" though, and usually I leave about half of the tang stamp exposed so, I don't corrode the bolsters. Opinels are awesome by the way, and everybody needs to try one IMO.
     
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