How should I store a lotus tsuba katana to preserve the metal fittings?
Updated Mar 2026
Metal fittings — particularly copper and bronze tsuba — are susceptible to oxidation and patina development over time, especially in humid environments. To preserve the finish, store your katana horizontally on a display stand in a low-humidity space, ideally below 60% relative humidity. Apply a very light coat of choji oil or camellia oil to the blade periodically to prevent surface rust, but avoid letting oil contact lacquered saya surfaces or handle wrapping. Handle the tsuba with clean cotton gloves when possible, as fingerprint oils accelerate tarnishing on copper and bronze. If a natural patina develops on bronze fittings, many collectors choose to leave it — it adds visual character consistent with aged Japanese metalwork traditions.