Mikawa Nagura 2030g The abrasive concentration is high

The abrasive concentration is high

This example is whiter than usual

The light colour is desirable and the wholesale cost of the stone was increased as a result

Mikawa Nagura are Tuff stones

does not differentially absorb water

Mikawa Nagura 2030g The abrasive concentration is highMikawa 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