About This Item
Vintage Nakayama Maruka Maruzen Kiita Japanese Natural Sharpening Stone 482g (1Lb. 1oz.)
It is used Nakayama Maruka whetstone. Maruzen stamp and Maruka stamp are on the side of the stone.
Maruzen should be one of the companies that had been dealer for Maruka by Hatanaka Whetstone Co.
It has still Maruka stamp and Maruzen stamp on the side of the face.
#6000 to #10000 or higher grit for finishing razor blade
It raises enough amount of black slurry quickly, so it does not need Tomo Nagura or a device that produces slurry, and the sharpening surface is very smooth too (the bigger Kanmaki, circle mark side is the top side).
(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 from bright silver color, and Hagane became from semi-mirror finish to 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.