Freckling
A couple of tricks the old timers taught me. You can use #0000 steel wool and gun oil to knock down light freckling so it either disappears or becomes a lot less visible. This is done with a light touch on the steel wool and certainly with nothing coarser than 0000 grade. The fine steel wool will not hurt a rust blue finish unless you polish hard in one spot for a long time. For heavier deposits of rust that resist the steel wool, they used to use gun oil and the neck of a brass rifle cartridge to knock it down. I use a brass brazing rod flattend down and squared off. Use plenty of oil. This may leave a little brass coloring on the gun but that is then removed with the 0000 steel wool. A doggy Luger can be made to look pretty good with a little TLC, just don't get too heavy handed.
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