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Oil Blackening?

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Tommy Atkins
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Oil Blackening?

#1 Post by Tommy Atkins » Mon Apr 15, 2019 11:25 am

Does it have to be petroleum-based oil, (not synthetic)?
Is dirty used engine oil really better because of the carbon content or can I just buy a pint of oil & use that?
TIA.

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Re: Oil Blackening?

#2 Post by jardows » Mon Apr 15, 2019 4:48 pm

Found some good info in this thread:
https://www.practicalmachinist.com/vb/g ... ion-84713/
it would appear your mainly going to see a difference in finish color.
I would probably try experimenting with some small parts to see what's best. My truck is overdue for an oil change, so I may try some different methods on small parts in a couple months when I'm free from class.

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Re: Oil Blackening?

#3 Post by 72 usmc » Mon Apr 15, 2019 5:09 pm

Real nasty black oil be obtained from the waste barrel at lawn mower repair shops. A nice old lawn mower from a junk shop that never had its oil changed is perfect for obtaining black oil for age/patina coloring wood stocks, new wood, new leather and most likely for oil blacking with heat.
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Re: Oil Blackening?

#4 Post by Rapidrob » Mon Apr 15, 2019 5:22 pm

I use waste diesel lube oil.
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Re: Oil Blackening?

#5 Post by Tommy Atkins » Mon Apr 15, 2019 8:07 pm

My apologies, I wasn't clear.
I'm trying to refinish worn "bluing" on a vernier target sight from the 20's. not wood, leather or anything else.
No9 sight opened.JPG

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Re: Oil Blackening?

#6 Post by 72 usmc » Mon Apr 15, 2019 9:40 pm

https://www.homemodelenginemachinist.co ... -oil.3341/ some ideas for oil blacking with heat. Most suggest used diesel oil with an additive of common graphite powder. I have not tried this. I use cream or solution.

No heat touch up
Or you can use an old antique solution of equal parts of apple cider vinegar and hydrogen peroxide(the strong stuff used at beauty parlors) then mix in some salt about 4 table spoons and a heaping table spoon of Brown mustard in an 8 oz cup. Put the solution an old iron knife or new hinge and it turns black, Heck just the brown mustard & vingar can turn a knife black. If you want to get a black like a Mosin black use G96 Cold Gun Cream blue, it can be controlled by adding oil that retards the action of the blue to come out more gray and less black as you rub it in till you get a matching black color. Parma Blue -Birchwood is real thin like water and makes a more colt blue color as a cold blue. I do not like it.

Another idea? I like tis for large areas. You saw this process?? https://www.youtube.com/watch?v=VHyoUF50rF0

the story here: http://www.surplusrifleforum.com/viewto ... =59&t=2922

I have had nice results with BROWNELLS - OXPHO-BLUE
see ist use & results here in 3 parts: https://www.youtube.com/watch?v=I2BI6hF0vZA
https://www.youtube.com/watch?v=p65uc1mwWP4
https://www.youtube.com/watch?v=eQ6LNhp9pfs
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Re: Oil Blackening?

#7 Post by Tommy Atkins » Tue Apr 16, 2019 11:08 am

Thanks, thats a lot of information. I'll give it a good look over.
I want to use a heat process for a couple of reasons. I have both the blues you mention, but for what I'm planning I don't think they're suitable even though they give a good black.

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Re: Oil Blackening?

#8 Post by Rapidrob » Tue Apr 16, 2019 12:48 pm

disassemble the sight,heat to a dull red ( not bright red!) and quench in the oil I listed.
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Re: Oil Blackening?

#9 Post by Tommy Atkins » Tue Apr 16, 2019 5:44 pm

That's interesting.
Everything else I've found indicates about 350° (straw coloration)!
If I need to go dull red (650°) its not going to happen as 2 of the parts are actually springs & I think that will mess them up!

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Re: Oil Blackening?

#10 Post by Rapidrob » Tue Apr 16, 2019 7:17 pm

Springs are to be blued.
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Re: Oil Blackening?

#11 Post by Tommy Atkins » Wed Apr 17, 2019 10:36 am

Ok, that was my next thought.
Its going to have to be cold blue though.

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Re: Oil Blackening?

#12 Post by Tommy Atkins » Wed Apr 17, 2019 1:29 pm

Well here we go.
Sight stripped down degreased & having a bath in Evap-o-rust, probably an overnight soak.
Some parts will get the B/C liquid & some others the G96 creme depending on what exactly is being blued. Some parts have in the white areas with scales so they'll get blued then buffed till the surface is in the white but the engraving is black.
The bits to the right aren't rusted at all so they're just sitting in oil.
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Re: Oil Blackening?

#13 Post by Tommy Atkins » Wed Apr 17, 2019 1:32 pm

dismantled as far as its possible & parts laid out so I can have a reference for reassembly!
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Re: Oil Blackening?

#14 Post by Tommy Atkins » Wed Apr 17, 2019 1:34 pm

Non-rusted parts soaking on oil on the right.
Parts with surface rust soaking it away on the left.
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Re: Oil Blackening?

#15 Post by Tommy Atkins » Wed Apr 17, 2019 7:45 pm

Worth the effort IMO.
I went with a couple of different cold blues as they all seem to work with some alloys better than others.
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