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Tarnished brass, I use vinegar and nothing for no more than 15 minutes, and 15 minutes is not necessary, then wash and then rinse, when dry I tumble
As to safe, I make spinners for shining brass for short runs meaning I can spin 20 cases for loading than I can tumble, advantage to spinning, I cram the spinner into the neck, if the neck is suspect it will split or crush.
I use vinegar for the worst of cases, vinegar cuts tumbling by days.
F. Guffey
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