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Old August 16, 2013, 01:48 AM   #15
Senior Member
Join Date: May 31, 2004
Location: Minnesota
Posts: 2,021
I had some similar spots on Fed 357 brass after experimenting with wet tumbling with a generic knock off of Simple Green. (Complex Cyan?)
My spots were darker and purplish and have not come off in several cycles of tumbling/shooting. They have a nice patina now.
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