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Asano naguras are not tomonaguras, they're mid grits though koma can easily be fine enough to shave off of. They are intended to be used in a grit progression. Botan is the coarsest, tenjou, mejiro,...

You can feel the slurry change if you 'feel' for it. For me it's usually about 15-20 strokes or so and you can feel the slurry get smoother.

I don't think the slurry ever breaks down completely...

I rinse mine off before and after. Before to remove any dust or particles that might cause honing problems, after because dried slurry can be messy and contaminate other stones, etc.

You can wipe...