Re: Black bores and 'Brown guns'
Bill,
The dark bores is where corrosive ammo has been fired in a weapon and not cleaned properly. The bore will rust and then eventually cleaned. After the ventual cleaning, the surface will be left with this dark color. If you were to look at the surface of the bore closely, you will see very fine surface pitting. Most of the darkness is iron oxide which has formed in/on the surface After firing some ammo and cleaned properly, most of the darkness will disappear, but the bore will have a dull shade to it. It may take several shooting/cleaning sessions to get this out.
The "Brown" color is the surface of the entire pistol. Instead of being blue, the metal is continuing the "rusting" process under the bluing. Since this process is not controlled, the color is "Brownish". Many time you don't see this if you are not in bright light. Take a Luger outside and observe the finish color. This is from age, and sometimes from improper storage.
Marvin
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