How should I store a gold-black handle katana to protect the ito and fittings?

For long-term display or storage, the primary concerns are humidity, direct sunlight, and contact pressure. Humidity above 60% can cause the same rayskin under the ito to swell slightly, which may loosen the wrap over time, while very low humidity can cause lacquered saya to develop hairline cracks. Aim for a stable environment between 40–55% relative humidity. Keep the sword away from windows or UV light sources, which will fade the gold ito and dull lacquer finishes. If storing horizontally in a bag or box, ensure nothing rests on the handle — sustained pressure can flatten the ito braid's raised diamonds. Apply a light coat of choji oil (clove-infused mineral oil) to the blade every few months and wipe metal fittings with a dry microfiber cloth to prevent tarnish on the gold-finished alloy components.

What gives blue manganese steel katana their color?

The blue finish on these katana is produced through a controlled surface treatment process - typically a combination of acid etching, heat application, and polishing - applied to high-manganese steel. This is not a painted or powder-coated finish. The manganese content in the steel reacts predictably to these treatments, producing stable cobalt, teal, and midnight-navy tones with genuine depth. The result is a surface finish that shifts subtly under different light sources, revealing layered blue-teal gradients up close. Because the color is embedded in the surface layer rather than applied on top, it holds up well under display conditions when the blade is kept clean and lightly oiled.

How large is a typical black odachi compared to a katana?

Updated Feb 2026

A standard katana blade measures roughly 60 to 73 centimeters (about 24 to 29 inches), while odachi blades in this collection typically exceed 90 centimeters (35 inches) and some extend past 100 centimeters. Including the handle, overall length frequently reaches 130 to 150 centimeters (roughly 51 to 59 inches). This means the complete sword is often taller than many wall-mounted display racks designed for katanas, so collectors should plan their mounting accordingly. The tsuka is also proportionally longer — usually accommodating a three- or four-hand grip — and the tsuba and other fittings are scaled up to match. This added scale is part of the odachi's appeal as a display piece, giving it a commanding presence that standard-length swords simply cannot replicate.