How should I store and maintain a light green ito katana for long-term display?
Updated Mar 2026
Preserving the quality of a display katana involves attention to both the blade and the handle materials. For the blade, apply a thin coat of choji oil or mineral oil every one to three months — this prevents oxidation on carbon steel and keeps the hamon visible and clean. For the light green ito wrapping, avoid prolonged exposure to direct sunlight, which can fade silk or synthetic cord over time. Humidity is the bigger concern: store the katana horizontally on a display stand in an environment between 45–55% relative humidity. Excess moisture can cause the same (ray skin or synthetic grip base) to loosen and may affect the lacquer finish on the saya. A silica gel packet inside a display case helps regulate moisture without contact with the sword itself. Never store the blade inserted in the saya for months without periodic removal and inspection.