How should I store a katana with an iron tsuba to prevent rust?
Updated Mar 2026
Iron tsuba are susceptible to rust in high-humidity environments, particularly if fingerprints — which leave salt and oil residue — are not removed before storage. The practical protocol: wipe the tsuba with a clean, lightly oiled cloth (choji oil is traditional; mineral oil is an accessible modern equivalent) before placing the sword in its shirasaya or storage bag. Silica gel packets inside a sword bag or display case help maintain stable humidity below 60%. Avoid sealed plastic storage, which can trap moisture rather than dispel it. For long-term display, a glass case with low-wattage lighting and good airflow is preferable to an open wall mount in rooms with fluctuating temperature. Never store a mounted katana touching another metal surface without a protective barrier.