How should I oil and maintain a Damascus katana in storage?
Updated Mar 2026
Damascus blades require light but consistent maintenance to preserve the etched surface pattern. Apply a thin coat of choji oil — a traditional mineral oil blend used for Japanese sword care — every two to three months using a soft, lint-free cloth. Work from the base of the blade toward the tip in smooth, even strokes, and avoid pooling oil near the habaki collar where it can seep into the saya and soften the lacquer over time. Store the katana horizontally on a padded rack in a low-humidity environment, ideally between 40–55% relative humidity. Avoid placing display pieces near exterior walls, heating vents, or windows where temperature swings are frequent. If surface oxidation appears on the Damascus pattern, consult a professional sword polisher rather than attempting abrasive removal, which can permanently damage the layered surface.