About This Item
Vintage Nakayama Maruka Asagi Kanmaki Japanese Natural Sharpening Stone 762g (1Lb. 11oz.)
It is used Nakayama Maruka whetstone. Maruka stamp is on the side of the stone. It has a circle black mark on the surface (Kanmaki or Karasu).
#6000 to #10000 or higher grit for finishing razor blade
It raises small amount of black slurry quickly, and it is hard and condensed stone. It is very high grit fine grit stone, but it still has strong polishing power. It is very smooth stone, so it does not need Tomo Nagura or a device that produces 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-------------- 9.2
(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 semi-mirror finish, and Hagane became mirror finish.
Nakayama whetstone is finest whetstone that is mined in Kyoto for almost 900 years ago. I think the mine had been closed more than 30 years ago. It had been very important as military affairs, because it is sharpener for weapons, so the mine had been protected by the Emperor of Japan or Shogun or Japanese Government for a long time. Only Honma family could have mined the mine for a long time. Nakayama Maruka is highly sought finishing whetstone even in Japan, because the mine was closed, and harder and harder to find. It is ideal razor hone or the cutlery that need very fine finish.
Probably #6000 to #10000 or higher grit with the same as artificial whetstone.
Natural whetstone has wider capacity than artificial whetstone has, and actually, we do not know until sharpen blade on the hone for a while. Because artificial whetstone molecules do not break down to smaller sizes, but natural whetstone molecules are possible to break down to smaller sizes, and those molecules are mixed with sharpened steel molecules, and make Jigane as suitable Jigane color, and Hagane as suitable Hagane color. It is natural mystics.