How do I maintain a carbon steel katana stored on display?

 Updated Mar 2026

Carbon steel requires periodic attention even when kept in its saya on a display rack. The primary concern is oxidation caused by ambient humidity. Every four to six weeks, remove the blade from the saya, wipe it clean with a soft cloth, and apply a thin, even coat of choji oil or a neutral mineral oil using a folded tissue or dedicated oil cloth. Do not leave excess oil pooled near the habaki or inside the saya, as trapped moisture accelerates corrosion rather than preventing it. Store the piece horizontally with the edge facing upward, following the traditional Japanese convention that also reduces stress on the saya's interior. Keep the display away from direct sunlight to protect both the saya lacquer and any wrapped ito from fading and drying.

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