How should I store a black and white katana long-term?
Updated Feb 2026
Long-term storage of any carbon steel katana — including black-and-white pieces — centers on three concerns: moisture control, blade protection, and UV exposure. Apply a thin coat of choji oil or neutral mineral oil to the blade every two to three months to prevent surface oxidation; too much oil can attract dust, so a light, even application with a soft cloth is sufficient. Store the sword horizontally or at a gentle angle (edge upward if on a traditional stand) rather than vertically, which can stress the habaki and saya fit over time. Avoid storage near exterior walls in humid climates, as temperature fluctuation accelerates moisture intrusion. For the lacquer saya and wrapped handle, a breathable storage bag or padded case is preferable to an airtight container, which can trap residual moisture against the wood and fittings.