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You can stone the edges on those chisels pretty easily. As a woodworker, and knowing that charns aren't as hard as trans and black arks, I wouldn't want to do much bevel work into those stones, even...

You can lay the back of a chisel flat and get the same effect (vs. using the bevel). There is less risk that way. Any $5 hardware store chisel will work fine, as would a hardened large knife (but one...