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I used to use a slurry, but not anymore. I just use the 1K until the visible nicks are gone and 4K until the bevel is properly formed. Then just small pyramids on the 4 & 8 and then a finishing hone...

Rottenstone can be found at woodworking stores. It is a powder made from decaying limestone. I have used it in the past on a paddle strop. It is very fine and breaks down with use. Maybe 1.0 micron?...

If a person wants a natural stone then they have to live with the variations in grit size and density. That's just the nature of the beast.
Most of us have seen this in Coticules, Eschers, Tam...

I have used the CH12k for several years now, but not exclusively. I think so much of it that I keep an extra as a spare, I do the same thing with Coticule/Eschers/Tam O'Shanters and other quality...