Reloading: Reclaiming Brass - The Shooter's Log

What is causing this mark on my cases

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Not quite a reloading question: dirty brass

Orbit Irrigation Brass Impact Sprinkler w/ Adjustable Tripod Stand

I guess Sig jumped on the brass coated steel train too : r/reloading

Best AR-15 Ammo (5.56/.223) of 2024: Range & Defense - Pew Pew

Brass color : r/reloading

Brass color : r/reloading

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Hornady Lock-N-Load Headspace Bushing D .400 - Rifleman Firearms