What carbon steel grades are available in the ninjato collection?

The carbon steel ninjato collection includes several steel grades that cover a wide range of quality levels and price points. The most accessible entry point is 1045 carbon steel, with approximately 0.45% carbon content - a tough and workable grade that produces reliable ninjato collectibles at an accessible price. Manganese Steel is featured across many pieces and is valued for its exceptional surface hardness and deep finish quality. 1090 carbon steel is a higher-carbon grade that sits above 1045 in terms of achievable hardness and edge retention. T10 carbon steel is the premium option in the collection: its tightly controlled grain structure and high-carbon composition allow for differential heat treatment that produces a visible hamon temper line - the wave-patterned edge boundary that forms during quenching and is one of the most visually prized details in Japanese sword collecting. All grades in the collection are used with full-tang construction, with the steel core running from blade tip through the complete handle secured by a mekugi pin.

What makes a clay tempered ninjato different from a standard ninjato?

The defining difference is the differential hardening process. A standard ninjato is typically through-hardened, meaning the entire blade reaches a uniform hardness after quenching. A clay tempered ninjato, by contrast, has an insulating layer of clay applied more thickly along the spine before the blade enters the quench. This causes the edge to cool rapidly into hard martensite while the spine cools slowly into softer, more flexible pearlite. The practical outcome is a blade with a harder cutting edge and a spine that can absorb shock without cracking. The aesthetic outcome is the hamon — a visible temper line along the blade that is unique to each individual sword, since the clay application and quench dynamics are never perfectly identical. This combination of structural duality and one-of-a-kind patterning is what elevates a clay tempered ninjato above a uniformly hardened counterpart in collector value.

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.

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.

What blue color configurations are available in the blue ninjato collection?

Updated Feb 2026

The blue ninjato collection includes several distinct blue treatment configurations that apply the color to different elements of the sword's design. Blue blade treatment pieces are the most striking: the color is applied directly to the straight steel blade surface, making the ninjato's full straight profile visible in vivid blue when drawn from the scabbard. In the shirasaya ninjato format - where the sword has a plain wood handle and scabbard without conventional fittings - a blue blade against a natural wood shirasaya creates a particularly dramatic warm-and-cool contrast. Blue scabbard configurations concentrate the color in the lacquered scabbard housing, with the blue impact strongest in the sheathed presentation while the drawn blade is in a conventional metallic finish. Mixed blue-and-black or blue-and-natural-wood configurations combine blue with neutral or dark tones for arrangements where the blue serves as a color accent rather than the sole treatment. T10 real hamon pieces with blue scabbard configurations add the visual detail of a clay-tempered temper line to the cool scabbard aesthetic.