Hi all.
Just got through tumbling a few wheats with glass beads. These are a blasting medium I use in cleaning and removing paint from old toy trains. They are 325 grit. Has the consistancy of baby powder. I put it, along with the wheats in my rock tumbler and let it run fo 24 hrs. The pennies were really rough. I think it done a pretty good job with no apparent damage. Just thought I would share.
PS I would still be hesitant to use this method on silver or any really valuble coin. But for normal everyday wheats, its pretty easy.
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