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The coticule rubbing stone or "cotigura" as I have dubbed it, is pure coticule and if you use it on an escher, you'll get a slurry comprised of both stones. It would probably hone really well!...

I have about four different escher stones and I just use them without a slurry stone. Why? None of mine ever came with a rubbing stone. I don't even know that the escher rubbing stone is made of...