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The legendary "Black Polish" ;)

James , you might have to draw up a graph :) but the Japanese have used a mixture called Nugui to cosmetically finish swords for centuries. It is basically powdered Jnat & powdered iron oxide but I...

Not to complicate things but the steel particles in the worked slurry might also add to the polishing effect or "multitude of cutting points Glen mentioned.

"Retroductive reasoning" is how my brain works Robert . ;)
I partly agree with this, "Maybe its not needed because the stone it comes from is adequate to do the job without the extra steps &...

Are you finding a need for tomo or just wanting to experiment ? The Atoma 1200 simplifies the honing process a lot if you're jumping from a high grit synthetic , 8-12k. If you want to replace the...

I assume you're referring to finishers. Jnat finishers are too hard to break down in 10 strokes but the chalky Nagura used with them breaks down plenty in about 30 back n forth strokes. In any case...