Author Topic: Using Jax Black (brass) type on steel - my experiences  (Read 644 times)

Offline AZshot

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Using Jax Black (brass) type on steel - my experiences
« on: November 09, 2024, 04:54:35 AM »
I'm building my first Kibler kit.  Thought I'd relay what I've found about Jax black finish on the steel parts. 

Back story is I always loved the browned rifles I'd see in the magazines in the 70s-1990s.  I still do like browned, and really wrestled with whether to brown or blue or "black" the rifle. I was on the fence until just last week.  While browning looks great, and like a lot of my antique, worn originals, this forum convinced me that is just "patina" from the past 100 years, not an original Appalachian finish from the 1840s.  The other argument made sense too, that it would look disjointed to have really nice finished wood with no dents or scratches, and old, rusty brown metal.  So I decided to use the Jax. 

I've been very pleased.  It works quickly, almost too easy (I was prepared to do a rust blue too). I'd heard that if things are polished too fine, it won't take very well.  With the lockplate, I did not find that to be the case.  I polished it quite a bit, down to maybe 500 (was using a diamond stone), then finished it up with some Mothers polish.  The lock got a very nice, black color with a deep blue look to it. 

Then I moved to the triggerguard, which I also polished pretty finely, but not quite as fine.  Didn't use a diamond stone, just files, then 220.  Followed that with Mothers, just because I like Mothers.  The triggerguard did not get as black, using the same technique.  That is one coat with grey scotchbrite, spray down with water, assess.  Then another or 2 more.  It looks great, but just a more "french gray" color.  I wonder if the steels are different, between the lock and triggerguard?

I also did the triggers/plate with very little polishing.  Just hit it with gray scotchbrite.  It didn't seem to to want to take much....I think polishing to fresh steel works better with Jax than the pebbly "as cast."   I'll post pictures later.

Offline Marcruger

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Re: Using Jax Black (brass) type on steel - my experiences
« Reply #1 on: November 28, 2024, 02:38:09 PM »
Good morning sir,

A couple of thoughts for you.  I wish I could locate it again, but in a longrifle book (Bivens?) I saw a late 18th Century ad from the Wilmington NC newspaper of the time.  It was a gunsmith offering his services, among which were blue or brown metal finishing.  Before that I rather assumed it was one or the other depending on time. He was also seeking high grade curly sugar maple. This was all pretty fascinating to me as I had read that in coastal towns like Wilmington, the predominant guns were smoothbore imports from England.  Economies of import versus building in location.  In NC you get to the Piedmont before you start seeing schools of builders. 

I am not surprised that you get different results blackening different composition iron/steel.  I once bought a modern firearm with a smaller-than-BB sized speck of rust in a prominent spot on an otherwise minty gun. With confidence I took it home and carefully popped the spot of rust off with a piece of brass.  I cleaned the tiny spot with brake-cleaner, heated it, and tried cold blue.  No change at all.  I did it again with three other cold blues.  No dice.  A small shiny silver spot.  I gave up. A few years later a friend really wanted it so it moved to a new home.  Something about that steel…..

Take a good look at your container of Mothers.  Many of the polishes contain a wax in the polish.  You might be polishing wax into the pores of the metal, thereby affecting the ability of the blackening to work? 

I think back on gunsmiths over 200 years ago.  Did they have the ability to get all metal finishes the same? 

Best wishes on your build journey. Happy Thanksgiving.  Marc

Offline jmf

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Re: Using Jax Black (brass) type on steel - my experiences
« Reply #2 on: November 29, 2024, 02:28:21 AM »
It would be pretty easy to check your assumption. Pull the trigger and polish a small spot on the unseen side, then use some of your jax on that.

Offline AZshot

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Re: Using Jax Black (brass) type on steel - my experiences
« Reply #3 on: November 29, 2024, 04:09:58 AM »
Thanks both for you comments, and happy Thanksgiving!


Offline Paul from KY

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Re: Using Jax Black (brass) type on steel - my experiences
« Reply #4 on: December 04, 2024, 10:30:53 PM »
I recently finished two Kibler Woodsrunner rifles and had similar results as you did.  It seems that the more finely polished the steel part is, the blacker the finish will be.  I did one lock plate, finishing with 600 grit wet or dry sandpaper, and the result was a jet-black finish. After I polished the parts, I heated them in boiling water because I've noticed that BC bluing and browning products work better if the metal is heated. Heated parts only needed one application of Jax to get good results. I also noticed that areas that are probably more tempered, like the S curve of the cock and the frizzen, have a somewhat bluish tint.