How should I care for a carbon steel Wado Ichimonji replica?
Updated Feb 2026
Carbon steel requires a small amount of routine maintenance to stay pristine. Apply a thin coat of choji oil or mineral oil along the blade every four to six weeks; this creates a barrier against oxidation and moisture. Before oiling, wipe the surface with a soft microfiber cloth to remove fingerprints, which contain salts that accelerate corrosion. Store the sword inside its saya when not on display, and avoid environments with sustained humidity above 60 percent — a silica gel packet inside the display case works well in humid climates. If you notice the earliest signs of surface oxidation, a gentle pass with a non-abrasive metal polishing cloth will restore the finish without damaging the steel.