How should I maintain and store a full tang ninja katana?

 Updated Feb 2026

Proper care keeps both the blade and fittings in excellent condition over the long term. For the blade, apply a light coat of choji oil or mineral oil every few months, or more frequently in humid climates, to prevent oxidation. Use a soft, lint-free cloth to remove fingerprints after handling, as skin oils accelerate surface rust on carbon steel. Store the sword horizontally on a display stand or in its saya with the edge facing upward — the traditional Japanese orientation — in a low-humidity environment. Avoid areas with significant temperature fluctuation, such as garages or exterior-facing closets. Periodically inspect the mekugi pegs and handle wrap for any loosening, and re-oil the saya's interior lightly to prevent the wood from drying and cracking around the blade.

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