Any thoughts on forcing a patina?

Discussion in 'DIY (Do It Yourself)' started by Kaw-liga, Apr 4, 2017.

  1. Mountain Tiger

    Mountain Tiger Member

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    I have a question for this thread since you guys know a lot!

    I accidentally patina'd a carbon steel blade several years ago with CLR and I liked the uniform dark wash it created.

    Seven years out it still looks good and seems to not have any issues.

    Can any of you tell me if there's a chemistry reason why I shouldn't use CLR again in the future to do a uniform dark patina intentionally?

    Enclosed are pictures of the knife. It's been used for years since the CLR.


    image1.jpeg image2.jpeg
     
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  2. Kaw-liga

    Kaw-liga Member

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    The only negative that I could imagine would be that it may not be the safest chemical to use on a knife that you would use for food prep. If this is a concern, a citrus, potato, red meat, or other food-based patina would be worth considering. Is it the same CLR that cleans off calcium, lime, and rust? If so, it would definitely be acidic and force a patina. I'm certainly not a chemist, but I took quite a bit of it in college and my job basically boils down to balancing large quantities of acids and bases. With that said, I wouldn't call myself an expert by a long shot. Thanks for posting. Oh, and if your Mora is stainless, you likely won't get a very dramatic patina, no matter what you use.
     
  3. Mountain Tiger

    Mountain Tiger Member

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    Ok, so it won't hurt the steel long term. Cool.

    I'm not planning on using it for food prep.

    I don't normally buy stainless anything. Not a big fan of stainless.
     
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  4. McKROB

    McKROB Member

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    Rhubarb is rich in oxalic acid and works great for forcing a patina.
     
  5. The Marsh Gorilla

    The Marsh Gorilla Member

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    After @STPNWLF ’s question in other knives thread I figured I’d go into more detail about how I cleaned up this “ancient to me” Old Timer my pawpaw gave me as a kid. It’d gotten stored in it’s belt sheath at the bottom of my knife box cause I simply didn’t dig slip joints very much for a long time. As you can see it had a fairly grimy old use patina and some rust in the nail nick.
    32CE0F12-7EBD-40C1-9331-DD4291B5E0DA.jpeg
    I scrubbed the old patina and grime off with a green scotchbrite pad then soaked the blades in white vinegar all morning to get the rust out the nail nick and force a new patina back on. Ended up having to use the awl from an SAK to get finish getting the rust out the nail nick, which to my surprise came out in one piece. Guess that’s because of the vinegar soaking. Then I put an edge back on the main blade with my red DMT bench stone to get the tip back to a sharp point and finished up both on my Lansky turn box ceramic sticks. Pics were taken before it got coconut oiled. 2CF62B4C-036D-4B9F-BC12-14D0CB7A304E.jpeg 2DB60D27-F847-4984-BEAC-38DE7298DAC6.jpeg
     

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  6. Knifehunt

    Knifehunt Member

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    Here is my 5 with a natural patina from hard use. I've used this one like a rented mule. IMG_20190212_114734576~2.jpg IMG_20190212_114800224~2.jpg
     
  7. Strigidae

    Strigidae Moderator Staff Member

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