The green colour on corroded brass is the copper coming out of the alloy. Loss of a component of an alloy is going to weaken said alloy. Probably not enough to be unsafe though.
I think Crapshoooter2's case is just the beginning of tarnish. Isn't particularly unsafe either.
A net search for "blemishes on brass cases" turns up 997,000 results. Mostly forum arguments.
"...you are talking over my head..." Keep in mind that engineers dig holes. snicker.
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