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Blue material on ammo

Blackhawks19

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Can someone explain what happened to this round? I had a few in a mag after I shot a 10.3” 5.56 gun suppressed and it had been a while since I shot it. I was under the impression it was just oxidized carbon but have no actual idea.
9A2595C5-05B7-46CD-8D8E-094726E72590.jpeg
 
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