Marco Califo
New member
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?