Plz help…sudden occurrence of tarnished brass

Pickle Rick

Sergeant of the Hide
Full Member
Minuteman
Dec 24, 2018
189
66
I’ve had the same wet tumbling process for years. Even the same exact bottle of Lemishine. Wet tumble 1hr with hot water, squirt of Dawn, and 1/4 teaspoon lemishine. Been working for years.

For AR cases I tumble before and after sizing (just to get lube out of the necks). All of a sudden, cases are coming out horribly tarnished after the SECOND tumbling only. I’m using Hornady unique wax (same tub). What gives? Same exact soap, different bottle is only difference. Is it the heat in my garage? Has been a horrible summer.