What is the best way to store a colored blade katana at home?
Updated Mar 2026
Colored blade katana - including blue and red manganese steel pieces - require slightly more attentive care than standard polished carbon steel blades. The surface color is produced through controlled oxidation or chemical treatment, meaning it can be affected by moisture, acidic contact from bare hands, and abrasive cleaning materials. For storage, keep the blade in its saya at all times when not on display, and ensure the saya interior is dry and free of debris that could scratch the treated surface. If displaying the blade outside the saya on a wall mount or stand, apply a very light coat of mineral oil or Renaissance Wax to the blade surface every few months to act as a moisture barrier. Avoid standard camellia oil on colored blades, as its acidity over time may interact with certain surface treatments. Store in a low-humidity environment - ideally below 50% relative humidity - and away from direct sunlight, which can fade heat-treated colorations over extended periods.