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There will be some variation but if the stone is consistent, a big part of the equation, then one can get a good feel for how things are going based on visuals.
The 20k Suahiro is one of the most...

Scratch-less finish is obtainable with J-Nats .
Pure mirror polish could be doable with J-Nats followed by some nanocloth work.
I finish a lot on 20k Suehiro, and there are always small scratches...