I got my delivery from AC today.
My Nakagawa Blue1 needed a touch up, so it got first go.
The sharpening experience on the BB is quite interesting. It is a hard stone that releases a bit of mud but is definitely not a muddy stone. Quite similar mud to Chosera 3k. The mud smells earthy, a bit like some Japanese naturals.
Feedback is quite good, especially the aural feedback, even if it is a bit 'screechy'. Tactile feedback is a bit strange. It almost felt like I had bits of broken burr in the mud between the stone and the knife, but there were none. I guess it's the feeling of tiny balls rolling under the knife? This was less pronounced when almost sharpened. Maybe that is part of the feedback?
Burr formation is tiny. I didn't know whether to reduce the burr, so I did (gradually reducing pressure then a longitudinal stroke). However, I didn't do any edge leading strokes and didn't repeat the last few pressure levels as I would with a synthetic.
It's seems a bit slower than a fine synthetic (say, a Chosera 3k). Even a little slower than Naniwa 6k diamond. Maybe similar to a fineish jnat? It could be that I kept going after it was already sharp because I couldn't use burr formation as an endpoint.
Results were pretty good. Very sharp. No indication of residual burr on paper towel. The edge is certainly finer than Chosera 3K. It's been so long since I used anything finer (except Naniwa 6k diamond, which I only use for high alloy steels) that I can't really compare the edge to something finer (say, a Kitayama).
I also polished the wide bevels. Quite a bit of contrast and overall quite bright, almost semi- mirror, without quite the cloudiness of some jnats. I had a few deep scratches in mine, a bit more like
@cotedupy 's effort with the coticule. Not sure if this means that my BB has a higher concentration of smaller sharper garnets or maybe I'm just showcasing my lacklustre polishing skills.
I also sharpened my utility knife (made this at
@Kippington 's forge out of 15N20 IIRC). It's sharpened at almost 30dps. It cut through paper towel without a problem, something that it has not done before sharpened at this angle.
I also bought a small stone for for my stainless veggie peelers. Took a while to sharpen them but they are very sharp now. So good to have sharp veggie peelers.
Overall, I'm pretty happy with these stones, especially the burr minimisation. Thanks
@cotedupy for the PSA.