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I think I figured out my problem. I was originally using turtle wax car wash with wax instead of dish soap. The first batch would come out fine but if I immediately tumble a second batch with exactly the same recipe as the first batch, I had a problem. Since I did not rinse out the tumbler but just emptied it after the first batch, I am thinking that there was a accumulation of the wax in the car wash and all of the grime leaving the coating on the black coating on the brass. I have gone back to dish soap and have not had the problem since.
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