BP will discolor brass, period! And it will corrode it pretty fast too! Most BP cartridge shooters take a jug of water & soap mix to the range with them to drop thier empty hulls is. This will help kill the acids in BP fouling and stop corrossion. But they will still discolor a good bit.
When you get home, remove the brass from the jug and air dry it, then simply drop it in your tumbler with your favorite media and brass cleaner. They will polish right up!.
I use a couple of ounces of brasso in my tumbler and it works great! I use brasso mainly because it is easily available , I get mine at Wal-Mart. I've heard some folks use Flitz and like it. Plain tumbler media will work, it just may take linger.
Hmmmm.., I'm using ground corncob media. I could be wrong (wouldn't be the first time!), but I think corncob works better as a cleaner cause it's more abrasive and walnut is a better polisher. Try some brasso with the walnut. Maybe it'll be enough to cut the black coating.
You may be right, I'm just not real sure which one is for what. I've just been lucky with the set up I'm using. Guess I'd better stick to it! Now, sometimes my cases aren't perfect. Sometimes I get cases that just won't clean up. But if I get them rinsed off and tumbled fairly quickley, say within 24 hours, they seem to do better. :-D
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