Brass tarnish - send it or not?

[d3ydx3]

I had some muddy range pickup brass that sat in a container for a few weeks waiting to be cleaned. Made the mistake of putting the lid on, which sealed in the moisture. Took the lid off a couple of days ago and there appeared to be a thickish black substance on the majority of the cases, which I'm assuming is corrosion. Here's what a case looks like after 5-6 hours of dry tumbling. The black spots are smooth with the rest of the brass. Send or no?

 

[Sigarmsp226]

A quick wet tumbling with SS pins will remove the majority if not all of that….I believe I am correct in saying that what has occurred is strictly cosmetic….Mark

Edited July 6, 2021 by Sigarmsp226

[SGT_Schultz]

42 minutes ago, pealandco said:

I had some muddy range pickup brass that sat in a container for a few weeks waiting to be cleaned. Made the mistake of putting the lid on, which sealed in the moisture. Took the lid off a couple of days ago and there appeared to be a thickish black substance on the majority of the cases, which I'm assuming is corrosion. Here's what a case looks like after 5-6 hours of dry tumbling. The black spots are smooth with the rest of the brass. Send or no?

 

 

 

Send it.

 

That stuff is cosmetic and irrelevant.

[ysrracer]

Yes, send it...

 

...to me. It's not safe for you to fire it. I'll take one for the team.

[OnePivot]

That's definitely not corrosion. It sounds like melted floor goo. I can't think of any brass corrosion that isn't chalky, dry and thin. 

[Steve RA]

Just stainless pin it.

[Farmer]

Probably a reaction from the container, moisture and spent powder residue. Wouldn’t have been a coffee can by chance? Like the others said, SS pin it and reload even if it all doesn’t come off.