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The manufacturer recommends against using oil
It burnishes out grains in the steel nicely
Mikawa Nagura are formed from lithified volcanic ash
These are A4 sheets of plastic film with polycrystalline diamond embedded
This particular one is harder than average
Mikawa Nagura 1288g The manufacturer recommends against usingMikawa Nagura are 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 recommend end users flatten the