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#584316 11/15/20 08:03 PM
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Boxlock
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Boxlock

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I am interested if anyone has thoughts about the case coloring on this Fox. It is a 12 GA CE grade made (I believe) in 1909. It appears to have been refinished but the case coloring is quite yellow, any ideas what causes this? Thanks for your help!




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Sidelock
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Varnish or oil top coating can do that. I cant see the gun clear enough to decide if that is what it is.

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Ted

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The colors that result from the case coloring process appear to be highly variable. It seems that the colors are the result of many different factors including the composition of the charcoal, temperature, the quench, the amount of air the parts are exposed to during dumping the contents of the crucible into the quench, aeration of the quench, the composition of the steel, etc. Most practitioners seem to get fairly consistent colors once they settle on a process using the same techniques and materials. Since many people who do color case hardening well are rather secretive about their process, it is not easy to say definitively what caused those particular colors on your gun. But whoever did it sure got very complete coverage.


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if you dont like it and it is not dried oil and/or varnish...prep with alcohol and try cold blue on a qtip, in a hidden area...if that looks good to you, then continya...or do nothing...


keep it simple and keep it safe...
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Oxidized oil comes off with a solvent
Sometimes guns turn brown with it
But a golden patina seems to always come from the pack
It is in the surface not on it

See what some nail polish remover and a tip does under the forend


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Is it possible to remove varnish buildup without affecting case coloring? What solvent to use?

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A non polar solvent will remove oils, varnishes, shellacs, lacquers, (all at different rates) without dissolving the metal oxides that make up case coloring.
Don't scrub.

You can rank their aggressiveness by volatility.
Hotter solvents evaporate faster.
So, acetone, ether, mek, lacquer thinner, xylol, pentane, hexane, heptane, petroleum distillates.

If you dab some on under the forend, and nothing lifts to a swab, it's the oxidation of the metal surface, not oxidized oils.

Off to the races.


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Sidelock
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Pretty sure that's just a bad job of case coloring. Bad pack, wrong mixture, too much heat, too little heat, quenched wrong, whatever.
JR


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Sidelock
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Originally Posted By: John Roberts
Pretty sure that's just a bad job of case coloring. Bad pack, wrong mixture, too much heat, too little heat, quenched wrong, whatever.
JR


Agreed.


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If you look at enough heat treated parts, youll see that bronzing on occasion.

In production, it turns out that the wrong alloy was used when the parts were made.

Every so often, somebody that is coloring parts runs into a problem like this, usually a quality control matter in their preparation of their pack, I dont recall ever seeing any evidence that said it was from the impurities in the rain barrel. Bubble size yes, but not impurities in the water.


Out there doing it best I can.
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