How should I store and maintain a collectible ninjato long-term?
Updated Mar 2026
For long-term preservation, the most important factor is moisture control. Carbon and manganese steel blades will develop surface oxidation if stored in humid conditions without protection. Apply a thin coat of choji oil or a neutral mineral oil to the blade every two to three months, wiping away any previous residue with a clean cloth before reapplying. Store the ninjato horizontally on a display stand or in its original box, away from direct sunlight, which can fade the sageo cord and dry out lacquered saya over time. Avoid storing the blade inside the saya for extended periods without occasional airing, as trapped moisture inside the scabbard is one of the most common causes of blade staining.