Really curious here. I've been reading some threads how some of the really hard asagi type Jnats finish best with nagura and not so much with plain water.
Has anybody noticed if the hard stones "mirror" like the hard ark stones do, and tried finishing on a prepped surface? I know the slurry keeps the stone surface fresh, so the use of them would never allow the mirror to build, no?
Is it wrong to assume that a hard Jnat with a mirror would finish differently from the same Jnat with a freshly "scrubbed" surface?

have any of you deliberatly built a mirror finish on your Jnat and used it as a final polish only? (this assuming the hard Jnats mirror)