- Jul 21, 2021
- Reaction score
Really enjoy how he shows all of the proofs as well.
Mikawa 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...