White Powdery Residue Inside Fired Brass

[WildRose]

I didn't say it was, only what it was from.

That white residue is brass tarnish/oxidation. Brass oxidizes as that color, copper is blue-green.

It's cause and effect of corrosion, simple as that.

Petey as noted above the white is some sort of salt, not simple tarnish. That's concerning and particularly so with the split case.

Yes I can be overly cautious with my brass but I got that way learning the hard way.

 

[WildRose]

This is what simple tarnish on brass looks like. What's being discussed here is not that.