How do I maintain a tamahagane blade for long-term display?
Updated Mar 2026
Tamahagane is not stainless, so surface care is essential. After any handling, apply a very thin coat of choji oil using a soft, lint-free cloth — excess oil should be wiped off, not left pooled on the surface. Store the katana on a proper horizontal stand with the edge facing upward, which is the traditional resting position and helps prevent uneven stress on the habaki (blade collar). Keep the display environment between 40–60% relative humidity and away from direct sunlight, which can fade the ito and accelerate lacquer degradation. Never seal the saya in an airtight plastic bag; the lacquer and organic fittings need modest airflow. Inspect the blade every two to three months and re-oil as needed.