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Old August 15, 2013, 11:10 AM   #9
Senior Member
Join Date: January 8, 2008
Posts: 803
Looks like some type of reaction with the copper to me. Typically comes from exposure to some type of acidic compound, and based on the spotting, it's almost like the brass got sprayed (perhaps with sweat?) prior to going into storage.

As long as there isn't any flaking going on that leaves pits, the cases are just fine. Not all that pretty, but structurally just fine.
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