Looks great Rick, thanks for taking the time
I posted this pic on the "What 'Traditional Knife' are ya totin' today?" thread least week, and it received a lot of interest and questions, so I thought I'd post the very simple procedure I used to get this dark, even forced patina on my GEC Northfield (polished) #72 in 1095. If the Mods in their wisdom choose to move this to the Maintenance, Tinkering & Embellishment board, so be it, but I wanted my friends at the Traditional board to be aware of it.
What you'll need:
- Apple cider vinegar
- Cotton balls and paper towels
- A pair of tongs or large tweezers
- Non-abrasive silver polish
- Rubbing alcohol, naphtha (lighter fluid) or acetone, etc.
Mask the handle material if it's stag, bone, or horn, etc. The vinegar can leach out the natural oils and dye, so try to keep it away from the handle scales. The ebony on my knife became slightly dry in spots, but it was good as new after a drop of lemon oil. If you do get any drying or discoloring, treat the scales with the appropriate moisturizer (mineral oil, lemon oil, etc.).
Clean the blade and/or springs thoroughly with the alcohol. Wipe dry and keep your fingers off the steel.
Pour enough cider vinegar into a small saucepan to cover the bottom, and carefully bring it to a boil. Good ventilation is a plus; it's smelly stuff.
Hold the cotton ball with the tongs, dip it in the pan and wipe down the steel from end to end with the hot vinegar repeatedly until the steel turns black. Keep dipping the cotton in the hot vinegar and wiping (about three to five minutes) until the steel color won't darken any further.
Use a folded paper towel to smoothly wipe away the vinegar on the steel in one smooth linear motion to avoid streaking or blotching. If the wipe doesn't result in a uniform color, apply more hot vinegar and try again. Wipe away any remaining vinegar from the handle and let dry.
Edit: Instead of trying to wipe away the vinegar to avoid streaking, just rinse it away with cold running tap water to neutralize the oxidization process, as noted in post #22. Dry thoroughly and oil.
At this point, your steel finish will probably still show some streaking or unevenness, so gently polish the surface out with a little of the silver polish until it's a uniform light-to-medium gray. Wipe off any residual polish, clean the steel thoroughly again with alcohol, dry and repeat the hot vinegar process, again being careful to wipe away the last vinegar treatment in a smooth, linear swipe.
Repeat the whole process as needed until the steel is uniformly blackened, with no streaks, voids or blotches. It's easier to do the springs and blade(s) separately, rather than trying to do everything in one session. Wipe the steel down with a liberal dose of oil when you're finished to remove any remaining vinegar and seal the deal.
Hope this was useful. Have fun, and take your time.
Last edited by Rick; 03-01-2012 at 02:58 PM. Reason: added refinement
Looks great Rick, thanks for taking the time
That is amazing looking! Thanks for sharing, I have to give this a go.
Very Nice! Thanks for the write up
It does look great. Thanks for breaking it down like that.
That really does look good. Well done!
I think this post is gonna get bookmarked. Excellent reference.
Does the patina give an extra protection to the steel, or is it purely cosmetic?
Nice! Will new layers of patina form on the blade once the process has been applied or does it pretty much stays black?
This is the first patina I have ever like the looks of. Excellent job and directions, Rick.
Rick, you're not wrong about this stinking...whole place smelled like a pickle-factory
I'm most impressed with your results and thanks for the detailed info. I tried it out before reading this thread so it's still a WIP. Probably I didn't coat the blade enough but I was quite pleased with my results. Couple of questions if I may? You say protect the handles but if you coat the backspring how is this possible? Surely it seeps inside the frame and can affect the scales? Although the stag on mine look OK. What do you mean by non abrasive polish? I've got some stuff we have here in Europe called 'Autosol', you can polish all metals with it except plate&alloy. Problem is it takes the black patina right off, must be too abrasive then? Maybe silver polish? I found the vinegar did get into the joint and made it very sticky & the knife hard to open, this is likely the grade of vinegar I was using.
Must try this out again tomorrow now that I know more, your result looks wonderful. I do hope the mods can keep this here as it is of great interest to traditional knife fanciers. More boiling soon, reek!
I've used apple cider vinegar the few times I've done a forced patina. Apple cider vinegar is a must! I usually soak the blade in it over night then the next day wipe the blade down with an oily rag. If you've ever seen my Para Military in CPM D2 that is how I did the FP on it. I was afraid that the TX heat making me sweat would be more then I would want to keep up with. All of my 1095 traditionals currently are all natural over time patina. The first knife I ever tried this on was a Old Timer Sharpfinger and it looked much like yours.
I found the old image of my old Schrade SF...
My CPM D2
Last edited by Peter Parker; 09-09-2012 at 12:48 PM.
Very cool. Add my "thanks" to the others, for the picture and the detailed process.
The next time (any of) you do this, please consider some in-process pictures.
To the OP: had you blackened another knife's blade with this procedure before this, or did you jump in with your GEC?
Also, do you have any pictures of its springs?
I used bluing formula from the gun store to blue this 80t old timer. I do it to all my carbon steel blades.
Thanks, Guys. I appreciate the comments.
I'm using a generic form of silver polish that's intended for jewelry and fine silver. It's a white liquid that looks just like Milk of Magnesia. The paste metal polishes like Flitz and Simichrome are too abrasive. You just want to polish out the patina until it's a lighter and more uniform shade of gray to serve as the foundation for your next vinegar treatment. Note that the more you use the silver polish, the more the glossy Northfield factory finish will start to turn to a dull matte finish, whereas it will retain its bright reflective polish (more like black chrome) if you're more sparing with the silver cleaner.What do you mean by non abrasive polish? I've got some stuff we have here in Europe called 'Autosol', you can polish all metals with it except plate&alloy. Problem is it takes the black patina right off, must be too abrasive then? Maybe silver polish?
It will work its way into the joint, but I've never experienced any sticking as a result. I just flush it out with oil and paper towels when I'm done, just like the oil flush you do on a new knife to clean out any residual polishing grunge.I found the vinegar did get into the joint and made it very sticky & the knife hard to open, this is likely the grade of vinegar I was using.
The sky is overcast today, but here's a pic of the backspring (the light areas on the lock release area are reflections):
Last edited by Rick; 02-21-2012 at 11:12 PM.
I'll say it again, Rick. That really looks good. The blade, spring & spacer, and in tandem with that ebony. It's beautiful.
Another note: I was telling my wife about this post, and she asked me which apple cider vinegar I used. I said "What? We have more than one kind?" to which she replied "Yep. The Heinz is the good stuff. The generic stuff; not so good." And sure enough, I definitely got the best results with Heinz vinegar, whereas the generic stuff make it more difficult to capture a deep, uniform black color without streaking or smearing. She said the Heinz is clearer and more acidic.
Last edited by Rick; 02-21-2012 at 10:11 PM.
Thanks Rick. I'll get some milder silver polish, that other stuff can shine anything! The backspring on your 72 looks a real treat.
Time to get some more Cider Vinegar, some Cider wouldn't be bad either
I've achieved a similar deep finish with gun metal blueing. Just dip it in and work it around with a q-tip. It works extremely fast. Once dry, I wash and dry the blade well. Then I highlight the edges and swedges by stropping.
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