Mikawa Shiro Nagura 12oz. (336g) Japanese Natural Sharpening Stone
Mikawa Shiro Nagura 12oz. (336g) Japanese Natural Sharpening Stone
Mikawa Shiro Nagura 12oz. (336g) Japanese Natural Sharpening Stone
Mikawa Shiro Nagura 12oz. (336g) Japanese Natural Sharpening Stone
Mikawa Shiro Nagura 12oz. (336g) Japanese Natural Sharpening Stone

Mikawa Shiro Nagura 12oz. (336g) Japanese Natural Sharpening Stone

Regular price $180.00 Sale price $165.00 Save $15.00
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Mikawa Shiro Nagura 12oz. (336g) Japanese Natural Sharpening Stone

Approximately 110mmx60-90mmx20mm

I am not sure which layer of Mikawa shiro nagura, but it looks medium-high to lower side of fine grit. It does not look finest class in Mikawa shiro nagura.

Hardness-------------8.2

It raises great amount of dark gray or light black color slurry.

(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----------7.8

It makes my blue II steel kasumi blade knife Hagane became bright silver color finish. Jigae became frosted silver color finish.

(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)

According to Dr. Kuniichi Tawara who is a Metallurgy doctor, and very famous Japanese sword researcher, Koma molecule is 10 to 20 micron.

It might be like Tenjyo and Mejiro and Koma class grit.

It should be a good sharpening stone right before starting the fine grit sharpening.