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Aha! So some slates do cut… I guess now you know my knowledge of stones is just passing… I look at a stone as it relates to how it cuts steel (tunnel vision?).
In fact I lapped the slate surface...

Thanks Jimmy.
Yup, the photos from my aging Nikon really does suck, and it doesn’t help when I reduce the photo width to 700 pixels as per forum upload rules… lololol.

The slurry does look...

You see what confuses me… I understand the slate they put on the back the Coticule is “useless” for honing… but this one cuts like the a demon… if didn’t know better I would say it’s Carborundum...

Got this stone in a box lot. Thought it was a vintage combo Coticule but not sure anymore. The lighter side is very soft and laps very easily, in fact will quickly clog 400 grit sandpaper with white...