The stone is not that porous and quickly saturates. It does retain swarf easily, a characteristic that it shares with the JNS 320. The swarf doesn't easily remove even with scrubbing with a nail brush. This doesn't interfere with it's performance. It also gives a relatively shiny finish.
I start off with a Moritaka 'mini nakiri' similar to a produce knife that fruit vendors use for sampling fruit to their customers or testing the quality of their produce. It is a kuroichi blue steel knife, a little more abrasion resistant but ultimately not quite as sharp an edge (a small difference most won't notice). Produces an excellent edge. An excellent match.
I comment on how to vary the stone's performance by water saturation levels, mud level, pressure, etc. I note bubbles coming up, a sign of a stone not completely saturated.
As an aside I comment on having the stone3 stay in place during a video, something I didn't do so well in an earlier review of a 400 grit stone and something I find annoying when others let their stone slide around..
Next I work on the Sugimoto Carbon steel short Chuckobocho. This also produces excellent results, easily yielding an edge tha both slices and push cuts paper well retaining some toothiness too.
We have another excellent Nubatama stone!