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Old March 21, 2013, 08:08 AM   #4
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Join Date: May 13, 2011
Location: Carolina
Posts: 3,331
Copper is generally visible. If you're unsure putting a little copper removing solvent in it will give you you're answer for sure as the patches will come out blue (depending on which solvent) afterward.

But, most handguns will go thousands of rounds before you ever need to do that as long as you're using some CLP or other general use product in between sessions.
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