Yeah, like the people who responded with " a small amount of ammonia will not harm your brass" have no experience.
So, did the sweets do anything to your barrel? Just curious.
BTW, the tumbler I use is sealed while it is in operation. No chance for dust to escape, but of course, a guy with as much experience as you already knew that. Any other reason I should tumble outside?
Do you wash all the dust off your brass after you take it out of the tumbler, like maybe with a garden hose on the front lawn? or do you just take that dusty, toxic brass straight back into the house?
Anyway, I shouldn't be funnin' someone of your experience. I'm sorry.