How should I care for a butterfly tsuba katana on display?
Updated Mar 2026
Carbon steel blades — whether 1045 or 1095 — are susceptible to surface oxidation if exposed to humidity, fingerprint oils, or fluctuating temperature. For display care, lightly coat the blade with a thin layer of choji oil or food-grade mineral oil every one to three months using a soft cotton cloth, wiping from the spine toward the edge to avoid micro-scratches. Avoid touching the flat of the blade with bare hands; the acids in skin oils begin surface etching within hours. Store or mount the sword away from direct sunlight, which can fade lacquer on the saya and degrade ito wrapping over time. The butterfly tsuba itself — usually brass or zinc alloy — can be gently cleaned with a dry microfiber cloth to remove dust without scratching the painted or patinated surface.