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I have no problem tumbling MY brass, and loads aren't causing soot. The problem I have is getting range pick-up brass clean to the point to where they can be fired, and then tossed in for about 2 hours to come out nice and shiny. Some of the brass I pick up has been sitting outside for a while and the cases are dark brown, almost black. If I spin the brass by hand in some steel wool, I can then toss them in and they clean up. But the process is time consuming. If I can get the tarnished cases cleaned the first time, they will clean up. It's just that initial cleaning that is needed to remove that dark tarnish. I use flitz polish in my tumbler. They eventually come out shiny but take a LONG time compared to brass I have already once cleaned. I don't like mixing my nice clean shiny brass with the dull tarnished cases.
Some of the range pick up brass almost appears as if it had been tarnished badly, then sprayed with lacquer. Indoor range brass I have no problems with.
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