Mikawa Nagura 2015g and saturating the pores with

and saturating the pores with water is suggested before use

The stone is porous

As for speed

This stone has a dent from the chiselling process

We receive the stones from the wholesaler with rough chisel marks on both sides

Mikawa Nagura 2015g and saturating the pores withMikawa Nagura are Tuff stones, a type of igneous rock formed from lithified volcanic ash. Mined in Aichi prefecture starting 700 years ago, they have been used in traditional Japanese sword polishing progressions. The mine has been closed since the 1970s. We receive the stones from the wholesaler with rough chisel marks on both sides, and flatten them in our workshop. Although we have made a good effort to provide a flat surface for usage, we strongly