How should I store a black-green lacquered saya long term?
Updated Mar 2026
Lacquered saya are sensitive to both excessive dryness and high humidity. Ideal storage conditions fall between 45–60% relative humidity — too dry and the wood core can contract and crack the lacquer surface; too humid and the wood may swell, making the blade difficult to draw cleanly. Store the katana horizontally on a display stand rather than upright, which prevents the blade from pressing unevenly against the interior of the saya over time. Apply a light coat of choji oil to the blade every three to six months to prevent oxidation, and wipe the exterior of the lacquered saya with a dry, soft cloth — avoid oils or solvents on the lacquer itself, as these can dull the finish or lift the painted motif over repeated application.