We recently received this question from a customer. Here is our answer:
Petosky stones are really hard to polish.
In the polish step, replace the water with corn syrup. Use Tin oxide polish only with clean plastic pellets.
You should also add a couple of tablespoons of vinegar.
If this doesn’t work, nothing will in a tumbler.
Most petosky stones are polished by hand and not in a tumbler.
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