How should I maintain and store a green sageo katana on display?
Updated Mar 2026
Proper care protects both the blade and the fittings over years of display. For the blade, apply a thin coat of choji oil or mineral oil every few months using a soft cloth to prevent oxidation - avoid fingerprints directly on the polished surface, as skin oils accelerate spotting. Store the katana horizontally or on a display stand with the edge facing upward in the traditional manner, away from direct sunlight, which can fade the green sageo and ito wrap over time. Humidity is the primary enemy of lacquered saya: keep the display environment between 40-55% relative humidity to prevent the lacquer from cracking or the wood from warping. For the sageo cord itself, avoid excessive handling or compression that would distort the braid - if the cord gets dusty, a soft dry brush is sufficient. Never store the blade inserted tightly into a humid saya for extended periods.