Getting discoloration off of brass

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goon

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Jan 20, 2003
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I took my Marlin out yesterday and put about 130 rounds of .357 and .38 Special handloads and some factory loads through it.
There is still snow and ice on the ground in PA (even more new snow today) and as a result my brass got wet.
I put it in a plastic bag, brought it home, and tossed it in the tumbler today. I noticed some discoloration but I figured it would come off with tumbling.
The nickel plated stuff cleaned up OK but the regular brass still has greenish black discoloration all over it.
Will this come off if I let it tumble longer? I already left it go for several hours.
Even if it doesn't come out shiny, can I still use it? I have read about some types of corrosion that can weaken brass so I am hesitant to use it, especially the magnum stuff.

It isn't like I can't stand to just toss it but I hate to throw away useable .38 brass and especially once fired .357.
 
I have used Brasso to clean them by hand, then tumble, works well.
 
Thank you.
At least it means I don't have to throw it out.
But I have been around here long enough that I should have thought to try the search function first...
:banghead:
 
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