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“I think AJ's numbers are a bit high, DT 6k, Purple 7-10k(maybe), Dark 10k+”

“The best I can say is Norton = DT < Purple slate = PHIG < Black slate. This is evidenced both by the feel of the edges...

How are you establishing the grit of your stones?

Yea, some can finish, but 12-15k seems a bit high for those slates.

Yea, Tom, they have been around a while and much is written about them. They were popular a couple years ago, though I don’t know anyone that still uses them regularly in a progression or as...