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Not really doing anything using the dry Coticule just following the usual BBW then Coticule and finally the Japanese natural.

Very true I noticed that after I cleaned this one up that it did appear to be a darker yellow than the newer ones. Denser concentration of Garnets maybe?
That may explain why this one using slurry...

It makes sense though.

I don't know if there is a difference between the new BBW/Coticules and the vintage BBW/Coticules. Mine is a natural vintage coticule I found in an antiques store that came in with a very old Bengall...

Gary,
I use water only as the finishing step in using the Coticule side. It works well for me. I'm wondering out loud now if the properties of the Naniwa 1000 in setting the bevel has any bearing...

Honestly after using my BBW/Coticule natural combo I've stopped even using a Norton. I have a Naniwa 1000 for bevel setting but after that the coticule is so versatile I don't need anything else...