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Old November 21, 2022, 05:30 PM   #1
Marco Califo
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Corn Cob Media Turned Green

I have been tumbling batches of brass in my FART. Something different happened in the latest batch. The corn cob media turned green. This media had been used several times, but was yellow when I put it in with 500 LC 5.56. That brass had been spilled in my garage and was swept up and cleaned, including a wet Tumble with pins and blue FART juice. So, put that fairly clean looking brass into the dried tumbler, with the reused media. I kept checking the brass and tumbled at least 6 hours. Shined up OK. But now I think I need to toss that media. Any ideas on what caused the color change?
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Old November 21, 2022, 05:58 PM   #2
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No but as mine gets dirtier it changes color . I think one could call it green . Not the same as yours but not to far from it either .
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Old November 21, 2022, 06:05 PM   #3
Marco Califo
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Thanks. I put a bunch of capfuls of NuFinish in that media, a cap or two before each 1000 piece run.
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Last edited by Marco Califo; November 21, 2022 at 06:31 PM.
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Old November 21, 2022, 06:22 PM   #4
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You only need a cupful or two, you might be adding to much polish and that's why you're having issues with it.
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Old November 21, 2022, 07:00 PM   #5
Marco Califo
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Tossed it

I just sorted through that last batch of brass and it left a bluish residue on my hands, that I promptly washed off.
That media got a lot of use tumbling big batches of brass. I guess when the color changes, and polishing had already slowed way down, that is a clear indicator the media is used up and needs replacing.
That media has been transferred to a plastic jar for disposal. I am going to tumble the last batch again with clean corn cob.
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Old November 23, 2022, 03:33 PM   #6
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Doesn't look all that bad, if you ask me. I do think after reading your follow-up post, I'd recommend wearing nitrile gloves when handling the media. And, if it's at the point residue is left on your hands, it's time to address it. If you're the frugal type, you can use Dawn or equivalent, to wash the media. It's loaded up with gunk and will take a couple of washing cycles to get it back up to snuff. Personally, I think it's a pain and not worth the few dollars saved.
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Old November 24, 2022, 11:11 PM   #7
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Probably nothing more than the media getting saturated with oxide from the brass.

But, corn cob media is derived from corn and if the media gets wet and is allowed to stay wet, the media could be starting to ferment.

In either case, it is time for new tumbling media.
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Old November 25, 2022, 12:01 PM   #8
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Corn cob media is derived from corn cobs, not grain corn. During the U.S. Civil War starving confederate troops made corn cob soup. They lost the war. No yeast smell in mine, it smells of auto polish. Now, if you would like to try making home brew from mine, I would suggest adding fermentable sugars, excess fruit, hops if feeling fancy, and a good dose of live yeast. Good luck with that.
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Old November 25, 2022, 12:59 PM   #9
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Quote:
During the U.S. Civil War starving confederate troops made corn cob soup. They lost the war.
LOL, are you stringing random bits of information together or are you drawing some sort of conclusion?
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Old November 25, 2022, 10:18 PM   #10
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Well, Double Naught Spy,
Let it ferment, then,
Catch as catch can.
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Old November 27, 2022, 12:40 PM   #11
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You seem to be drawing a conclusion that the Confederates ate corn cob soup and them losing the war is somehow tied to that. No fermenting necessary.
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Old November 27, 2022, 12:49 PM   #12
Marco Califo
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I was poking fun at hdwhit bringing up fermentation. I do not believe corncob media is fermentable.
You are correct that I strung together bits of information leading no where, consistent with hdwhit's fermentation angle. Sorry if that confused you.
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Old November 27, 2022, 01:36 PM   #13
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If it is made of/from organic material (plant/animal matter) it can rot.

Fermenting is a special form of that, as bluing is a special form of rust. One can still have rot without fermenting, if the conditions and materials for fermentation are not present.

Still, I think your answer might be closer to home...

Quote:
This media had been used several times, but was yellow when I put it in with 500 LC 5.56. That brass had been spilled in my garage and was swept up and cleaned, including a wet Tumble with pins and blue FART juice.
IF I remember art class correctly, yellow and blue make green!!!
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Old November 27, 2022, 06:39 PM   #14
Marco Califo
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After tumbling with pins, I drained, and poured off the now black blue FART juice directly into a toilet. I rinsed the brass, and used a media separator and strainers, pouring back and forth. The tumbler body was stored open end down overnight indoors (very dry air). It was dry to the touch. The media was around a gallon in volume. I do think the media picked a lot of tarnish, which caused its effectiveness to degrade in that last run.
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