Mikawa Shiro Nagura Chu Nagura 2lb. 5.8oz. (1074g) Japanese Natural Sharpening Stone

Mikawa Shiro Nagura Chu Nagura 2lb. 5.8oz. (1074g) Japanese Natural Sharpening StoneApproximately 180mmx60mmx47mm   It is pretty nice shape and good enough size to sharpen on the Chu Nagura. Koma, Mejiro, and Tenjyo are fine grit( medium high grit to entry class of fine grit) layers of Mikawa Shiro Nagura. Botan and Atsu(Chu Nagura) are medium grit to medium high grit stone.   Hardness-------------8.6 It raises very good amount of black color slurry quickly. It is kind of hard condensed stone. (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----------6.5   It makes my blue 2 carbon steel blade Hagane became mirror frosted silver with fine scratches looking like medium grit. Jigane also became medium grit scratches and frosted silver color.   (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-