Aku, or charred straw, is used as a coating when forging traditional steels at very high temperatures in the processes of japanese swordsmithing. The charred straw is both a light source of carbon for the steel, as well as an anti-oxidizing coating when it liquifies near welding temperature.

Making aku – Fabrication d’aku

Aku, or charred straw, is used as a coating when forging traditional… Continue reading