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Sharpie wears off in the vibratory.
I have tried as I would like to mark batches and have them stay marked.
Most annoying, I may try the colored vs black and see if any better.
I think I would pay extra to have a 1 or 2 or something else on the rim to keep them separated.
Marks on the rim work but I haven't found a quick easy one that I could spare more than one batch.
Certainly an area needing a solution.
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