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Very interesting! I have done a couple of bronzefill objects in a small Lortone tumbler using surplus 6-32 brass machine screws as the tumbling media, but always with water and a drop of soap to try to keep the object from being coated. I have wondered whether perhaps it was getting a little bit of brass on it anyway, though. As it happens my tumbler is all dried out from the last run, so I will definitely try printing something in white and tumbling it for a while. BTW, surplus may be a good way to find screws for this kind of application; I bought the brass ones for about a tenth of what they would have cost new since I didn't care at all about the size.