Brass coming out of stainless tumbler a dark color

[MegademiC]

Does solvent clean it to expose brass underneath?

That just looks wrong. Are you sure it's not brass plated steel? I don't think anyone even makes it, but I could be wrong.

[jbdesigns]

Nickel plating is very thin. You could wear it off tumbling for a long time.
2hrs is all that's needed for pistol brass.
I've done incredibly dirty and corroded rifle brass for 2-3 hours. Water is real dirty, but brass clean and shiny. Squirt of dawn and 1/4 teaspoon or sow if lemishine


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[Noodles]

Does solvent clean it to expose brass underneath?
That just looks wrong. Are you sure it's not brass plated steel? I don't think anyone even makes it, but I could be wrong.

I don't know what solvent would do. I'll go and scratch one next chance I get, and try a couple different things to see how deep the stain is.

And yes, I'm 100% certain that this is brass. I should have more explicit originally I guess. There are no nickle or steel or any other cases in here. It was just 9mm BRASS that tumbled for 8 hours in it's own filth.

Nickel plating

Nope


I'll knock it down to 2 hours, but leave this up as a warning to what happens if you forget you have brass running.

[MegademiC]

The solvent is to determine if it's a carbon coating on the brass or something else.

[The FNG]

I've had that happen with brass that was old and sat outside for about a year. It wasn't yellow going in, it was black. It never came clean. What was the condition going in?


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[Noodles]

I've had that happen with brass that was old and sat outside for about a year. It wasn't yellow going in, it was black. It never came clean. What was the condition going in?

Range-dirty. But definitely yellow. Once or twice fired.


I had no luck with Hopps#9 solvent, but did with scratching it. Current theory is that I let it tumble too long in dirty water and stained the outside of the brass with it's own dirty water. If I can remember to, I'll run that batch again this week with clean water and check it every hour to see what happens.

It's fully clean, so I could just load it and forget about it. I'll definitely make sure to run for 2hr or so next time.

[Noodles]

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I put the stained brass back in for another 2 hours as clean as could be. It came out better, not great but better. Water was filthy again.

Tumbled some more today for 2hr, basically it was why I expected, you tumble too long in black water and it can stain the brass.... I'll be damned.

[jbdesigns]

Glad you are finding the right combination to get good results.

I tumbled some more and 2hrs seems to be plenty good for pistol brass. I go 2hrs for rifle, primer in, then lube and size it removing primer as well, then I tumble again for two hrs to remove lube and clean primer pockets.


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