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As you'll discover, if you follow the link... CBC is MagTech. It's decent brass, in most cartridges.
The discoloration you see, is from tarnished portions of the cases having the zinc leached out. It shouldn't pose a problem, unless the case feels weakened. In ultra-common cartridges (like 9mm and .40 S&W), I generally just toss the cases in the recycling bucket, though.
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Don't even try it. It's even worse than the internet would lead you to believe.
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