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"I too have suspected that the rough surface from a diamond plate stone can impact the stones ability to polish."

"In Grinding and Honing part 4 Bos warns against lapping with diamond because he...

Wow, very interesting results and photos. The white line can be a reflection. I have notices this with very smooth shiny bevels and edges from a CBN edge, where the edge is very thin.

The test...

No, really, I have moved more to Jnats, that provide a keener and smoother edge. I have not experimented with Coticules much, in the last couple years.

Though I buy them when I find them at good...

I have several natural Coticules and several of the “French” stone, probably some La Lune, though none of mine are labeled.

And yes, they can deliver a keener edge. There is a lot of history...

While I agree that a bevel micrograph is not a predictor of the quality of the edge or its ability to shave, Philipp has a nice collection of vintage Coticules and appears to be a capable honer, by...

It’s an old Seraphim post.

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It would be interesting to see what if any difference honing under running water would produce.

Nice work. Have you tried other slurry stones, I have been experimenting with a Translucent Ark slip.