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You can try using gunblue to darken it, but it really depends on the type of metal you are using it on. I've gotten brass to go completely black, some aluminum goes dark black as well, other types of aluminum goes an ugly splotchy brown colour, pot metal can and sometimes does go pitch black as well (cleaned up a scratched TM mag catch last weekend, made it look good as new.) Since it goes into the metal as opposed to just sitting on top, the finish could look better than painting it. It also could not, all you gotta do is try a small area and see what happens.
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