What is the best way to store a ninjato with a dark blue lacquer saya?

 Updated Mar 2026

Lacquered saya are sensitive to two primary threats: prolonged moisture and direct UV exposure. Store the piece horizontally on a padded rack away from windows, ideally in a room maintained between 40–60% relative humidity. High humidity causes the wood core of the saya to swell, which can trap the blade and stress the lacquer surface; very low humidity causes the wood to contract and crack the lacquer at stress points near the koiguchi opening. Apply a light coat of renaissance wax or furniture paste wax to the saya exterior once or twice a year to maintain the lacquer's surface seal. The dark blue pigment in the lacquer is particularly vulnerable to UV fading, so display cases with UV-filtering glass are strongly recommended for pieces displayed near natural light sources.

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