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I was not aware stones from La Dressante layer may have such grainy surface.
From what I know the appearance within one layer is quite similar to all stones but their sharpening properties (speed...

Hello Peter,

Thanks a lot, I’ve just had a look to the La Grise documented in Henk‘s „Grinding and Honing Part 4“...

Dear Coticule users,

for some reason i was not able to start a new thread on coticule.be any more.
I'd like to identify the layers of 2 coticules i've recently purchased.

Hope you can help me...