How should I store a shirasaya aikuchi to protect it long-term?
Updated Mar 2026
Proper storage starts with a light coat of choji oil or food-grade mineral oil on the blade before the piece goes into its saya. Carbon and Damascus steels will develop surface oxidation if left unprotected, particularly in humid environments. Apply oil with a soft cotton cloth, wipe away any excess, and reinsert the blade carefully. The wooden saya itself should be kept away from direct sunlight and significant humidity swings - both can cause the wood to expand, contract, and eventually warp or crack. A horizontal display mount or a padded storage box with silica gel packets is ideal for long-term preservation. Inspect the blade every three to four months, re-oil as needed, and check the saya fit to ensure nothing has shifted.