Vintage Nakayama Maruka Renge Suita Maruichi Japanese Natural Sharpening Stone 1502g (3lb. 5oz.) Size: 210mmX80-83mmX30-38mm
***It had one crack portion when I got it on nearby Maruichi stamp, and it was clean crack (fallen apart), so I put back with glue and sealed it, so it should be strong enough. I will show where it is the fallen portion in the video clip.***
It has Maruka and Maruichi stamp on the side and the sharpening surface vividly; it has still excellent condition original box. Once it makes wet, the sharpening surface and bottom shows pink renge pattern.
#6000 to #10000 or higher grit for finishing razor blade
It raises very good amount of black slurry quickly, but it is kind of soft side stone. It does not need Tomo Nagura or a device that raises slurry like Diamond lapping 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-------------- 8.9
(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 finish, and Hagane became semi-mirror 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 needs 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 unbond 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.