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Bart doesn't sell them. Just go to Ardennes site and email them and let them know what you're looking for and they can pick one out for you I'm sure :)

If you buy JUST a Coticule, then yes, it is fixed to a slate back and should not be used to hone.

A combination is, in a most cases a natural occurance where the coticule layer is right next to...

Looks like a translucent Arkansas stone to me.

I don't know much about them, but I heard they work well.

I would still go with a coticule, and the reason why, is that it's like buying a couple...