Hardness--------8.6
It raises very good amount of black slurry quickly, so it might not need Wakasa Tomo Nagura or a devise that generates slurry. It looks not too hard and not too soft. It is ideal hardness to me.

(Scale; 1 to 10, 1-3 is very soft muddy rough grit whetstone 3-6 is soft medium grit whetstone,
6-8 is hard medium grit whetstone; 8-10 is fine grit whetstone)

Particle Size------- 9.0


(Scale; 1 to 10, 1-3 give deep scratch marks to the steel, 3-5 is delete the 1-3 scratches, 5-8 makes the steel cloudy, 8-10 makes the steel semi-mirror finish or mirror finish)

It makes my blue II steel blade knife Jigane became shiny bright silver color to semi-mirror finish, and Hagane became mirror finish.

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