How should I store and maintain a clay tempered tachi sword?
Updated Mar 2026
Clay tempered high-carbon blades require modest but consistent care to preserve their appearance and the integrity of the hamon. Store the tachi horizontally or at a slight angle in its saya, edge upward in the traditional orientation, in a low-humidity environment - a climate-controlled room or a display case with a silica gel pack works well. Apply a light coat of food-grade camellia oil or mineral oil to the blade every one to three months using a soft, lint-free cloth, wiping from habaki to tip in a single direction. Avoid fingerprints on the polished surface; skin oils accelerate oxidation and can mottle the hamon over time. Never store the blade in a leather-lined case, as leather retains moisture. If the blade develops light surface rust, remove it gently with a uchiko powder ball before re-oiling - never use abrasive compounds.