How should I store a chokuto to preserve its condition?
Updated Feb 2026
Carbon steel blades — whether 1045 or T10 — are susceptible to surface oxidation if left unprotected. For long-term display or storage, apply a light coat of choji oil or food-grade mineral oil to the blade every few months, or more frequently in humid climates. Store the sword horizontally or at a shallow angle with the edge facing upward if using a traditional stand. Avoid airtight cases without desiccant packs, as trapped humidity accelerates rust. When handling, use cotton gloves or wipe down the blade afterward — the oils from skin contact are acidic enough to etch carbon steel over time. The lacquered hardwood saya provides some protection in storage, but do not leave the blade sheathed for extended periods without periodic inspection.