Maruichi Maruka for Kamisori 

Narutak-toi are fine stones obtained from the Narutaki, Umegahata and Takao areas.

The Japanese natural stone NARUTAKI AWASEDO Maruichi Maruka for Kamisori, specially selected for the finishing of razor sharpening, works quickly and produces a sufficient amount of its suspension. The suspension does not require a softer stone (mikawa or tomo nagura) or a worn diamond plate.

On the Aogami 2 steel blade, the Hagane has a mirror finish, while the softer Jigae has a bright matte silver finish.

The Narutaki sharpening stones are among the finest mined in Kyoto for almost 900 years. In the Samurai era, it was very important as a military matter, as it was a weapon sharpener, and for hundreds of years the mountains were guarded by the Japanese emperor, shogun or government. Only the Honma family exploited the mountain for a long time. Narutaki-to was used for sharpening and polishing Japanese swords, but smaller or lower quality stones were also used for Kanna (Japanese chisel), planes, Kamisori, etc.

A natural grinding stone has a larger working scale than an artificial one, so we don't know the exact result until we finish sharpening. The abrasive of artificial whetstones does not break down to smaller sizes, and the natural particles can be broken down to smaller sizes, which are mixed with the scrap of ground steel to give a suitable Jigane and Hagane finish.