What is a shikomizue and how does it differ from a standard straight sword?

A shikomizue is a concealed sword - a straight blade housed inside a staff, cane, or bamboo-pattern outer casing rather than a conventional sword scabbard. The word combines shikomi, meaning hidden or concealed, with zue, meaning staff or cane. In Japanese martial history, concealed weapons of this type were used when carrying a visible sword would be prohibited or inadvisable. The bamboo-style shikomizue in this collection presents the sword as a bamboo staff in appearance, with the blade concealed inside. The sword is drawn by separating the two sections of the outer casing to reveal the blade below. As a display collectible, the shikomizue is a distinctive conversation piece - it presents as a bamboo staff until the concealment is demonstrated. The straight blade inside follows the same construction standards as the standard ninjato pieces in the collection: the same steel options, the same full-tang construction where applicable, and the same care requirements for the blade under its concealment.

How do I maintain a red-black ninjato on display?

Carbon steel is reactive, so the primary concern is moisture. Apply a thin coat of choji oil — or any light mineral oil — along the blade every four to six weeks using a soft, lint-free cloth. Wipe in a single direction from spine to edge to avoid leaving swirl marks on the polish. If your display area is humid, consider placing a small silica gel packet inside the saya when the blade is sheathed. For the lacquered saya and fittings, a dry microfiber cloth removes dust without scratching the finish. Avoid silicone-based polishes on lacquerwork, as they can cloud the surface over time. The ito wrap benefits from occasional gentle brushing to keep cord fibers from compressing unevenly.

How is the dark blue color applied to the blade?

The dark blue finish on these ninjato blades is achieved through one of two main processes, depending on the specific piece. The first is a controlled chemical oxidation or bluing treatment applied directly to the steel surface, which creates a thin, stable iron oxide layer that reads as deep blue in most lighting conditions. This is a traditional metal finishing technique, not a painted or powder-coated surface, so the color has a depth and sheen that changes subtly as light angles shift. The second method involves etching or acid treatment that interacts with the steel's grain structure, particularly on blades with a visible hamon, where the temper line creates a lighter contrast against the darker field. Neither process is purely decorative - both produce a surface that resists light surface oxidation better than raw polished steel, which also has practical benefits for long-term display and storage.

How should I care for a wave blade ninjato kept on display?

Carbon steel and manganese steel both require periodic maintenance to prevent surface oxidation, even in a display setting. Lightly wipe the blade with a soft, lint-free cloth every four to six weeks to remove dust and any ambient moisture that has settled on the steel. Apply a very thin coat of camellia oil or a dedicated blade oil using a clean cloth, then remove any excess - oil left pooling on the surface can attract dust and create uneven staining. Store or display the ninjato away from windows with direct sunlight exposure, as UV light and temperature fluctuations accelerate oxidation on bare steel. In humid climates, a silica gel packet placed inside a display case significantly extends the time between maintenance sessions. Keep the blade in its saya when not actively being inspected, as the lacquered wood provides a meaningful barrier against ambient moisture.

How can I maintain the hand-sharpened edge quality on my ninjato over time without professional resh

Updated Feb 2026

Maintaining hand-sharpened edge quality is primarily about preventing damage rather than correcting dulling. The most important practice is proper storage: keep the ninjato in its saya whenever not actively displayed or examined, as the wooden scabbard prevents accidental edge contact and environmental exposure. When displaying the blade unsheathed, position it edge-upward on a stand that supports the blade without contacting the edge. Apply choji oil or light mineral oil to the blade every one to two weeks using a soft cotton cloth with smooth strokes along the flat of the blade, never across the edge. This oil film prevents the microscopic corrosion that attacks the thin edge line first because the steel is thinnest and most exposed there. If you do notice slight dulling over time, you can perform touch-up maintenance using a fine whetstone of 3000 grit or higher, making light passes along the existing bevel angle. Count your strokes and apply equal attention to both sides of the edge to maintain symmetry. Limit touch-up sessions to 10-15 light passes per side — the goal is polishing the existing edge rather than creating a new bevel. For any significant edge damage like chips or rolls, consult a professional rather than attempting repair with coarse stones, which can permanently alter the blade geometry established during original hand sharpening.