How should I store a manganese steel aikuchi long-term?
Updated Feb 2026
Long-term storage for a collectible aikuchi involves three primary considerations: moisture, light, and pressure. Keep the blade seated in its saya at all times outside of inspection — the scabbard protects the blade geometry and keeps ambient humidity from settling on the steel. Apply a thin, even coat of choji oil or food-grade mineral oil to the blade every three to four months, or more frequently if you live in a coastal or high-humidity climate. Store the piece horizontally on a padded rack rather than standing it vertically for extended periods, as vertical storage can place uneven stress on the saya's interior fit over time. Avoid placing the aikuchi in airtight display cases without a small silica gel packet, since trapped humidity is more damaging than ambient air. Direct sunlight should also be avoided, as UV exposure will gradually fade lacquered finishes and dull the color of copper fittings.