What steel types are used in your Green Ninjato swords?

Our Green Ninjato collection primarily features two carbon steels: 1045 and T10. The 1045 grade contains roughly 0.45 percent carbon, which produces a tough, resilient blade with a clean dark finish that pairs well with green fittings. T10 steel adds a small percentage of tungsten to a high-carbon base, increasing wear resistance and — more importantly for collectors — enabling differential clay hardening. That process creates a visible hamon temper line along the blade, meaning each T10 ninjato carries a unique wave pattern that no two pieces share. Both steels are well suited to display pieces because they hold an attractive surface finish over time when properly oiled.

What makes a pattern steel ninjato different from a regular ninjato?

A pattern steel ninjato starts with a billet composed of multiple layers of steel that are forge-welded, folded, and drawn out repeatedly. This process — often called Damascus folding — creates visible grain patterns across the blade surface such as wood-grain, twist-core, or ladder designs. A standard ninjato might use a single type of monosteel like 1060 or 1095 carbon steel, which produces a clean, uniform surface but lacks the layered visual texture. Beyond aesthetics, the folding process refines the internal grain structure of the metal, reducing impurities and distributing carbon more evenly. This means a pattern steel blade tends to have a more consistent microstructure from spine to edge. For collectors, the layered steel is a major part of the appeal because each blade develops a unique surface pattern during forging that cannot be exactly replicated.

How does the ninjato's straight blade affect its look on a display stand compared to a katana?

The ninjato's straight or near-straight blade profile creates a distinctly different visual rhythm on a display stand compared to the katana's elegant curve. Where a katana's curvature draws the eye along a flowing arc, the ninjato presents a clean, geometric horizontal or vertical line that reads as deliberate and architectural. Collectors who display multiple Japanese swords often find that pairing a straight-bladed ninjato with a curved katana creates a visually balanced contrast — the two silhouettes complement rather than compete with each other. The gray manganese finish also tends to read differently under display lighting than a polished blade, absorbing light rather than reflecting it, which gives the ninjato a quieter, more subdued presence that can anchor a multi-piece display without overwhelming it.

Why do ninjato in this collection have colored blades?

The blue, dark red, and smoke-black blade finishes found on several pieces here are applied through controlled oxidation or chemical treatment processes that create a stable surface layer on the steel. These finishes serve a dual purpose for collectors: they provide a degree of corrosion resistance compared to a bare polished surface, and they produce a visual character that a natural polish cannot replicate. A deep indigo blade paired with a gold geometric tsuba and crimson lacquer saya, for instance, creates a color composition that reads as a deliberate artistic arrangement - exactly the kind of visual impact that makes a display piece worth owning.

How should I store and maintain a black lacquer ninjato saya?

Updated Mar 2026

Lacquered hardwood sayas are more sensitive to environment than the blades they house. Avoid storing the ninjato in direct sunlight, which can cause the lacquer to yellow or crack over time, and keep the display area away from heating vents or air conditioning outlets that create rapid humidity swings. Relative humidity between 40-60% is ideal; a small silica gel pack inside a display case helps regulate moisture in damp climates. The blade itself should be lightly coated with a neutral oil - choji oil or a modern mineral substitute - every three to six months, or more frequently if you live in a humid coastal environment. Never apply oil to the lacquered saya surface itself; a soft dry cloth is all that's needed to remove dust. Inspect the habaki and tsuba fittings periodically to ensure no moisture has migrated into the mekugi peg area.