Jade Shadow – Hand Forged T10 Tool Steel Katana Sword

Jade Shadow – Hand Forged T10 Tool Steel Katana Sword

T10 tool steel responds to clay tempering the way few steels will. The Jade Shadow (碧影) is built around that response – a blade hardened differentially so the edge holds under sustained cutting stress while the spine retains the flex that keeps a working katana alive in your hands. This is not a display piece. It is a tool built to be used.

Specifications

The Steel

T10 is a tungsten-alloyed high-carbon tool steel. The tungsten content raises hardness ceiling and wear resistance beyond what standard high-carbon grades achieve – the edge simply holds longer between sharpenings under real cutting loads. Clay tempering – the process of applying refractory clay along the spine and sides before the quench, leaving the edge exposed – creates a hard martensitic edge zone and a softer, tougher pearlitic spine in a single heat cycle. The result is differential hardness built into the blade’s structure, not a surface treatment that wears away. You will see the hamon (the visible temper line) running along the blade where those two zones meet – on the Jade Shadow, it is there to be read as evidence of the process, not as decoration.

The iron fittings are in keeping with this blade’s character: unadorned, functional, with the kind of visual weight that suits a working sword. Nothing here is there for show.

In Your Hands

The 72 cm blade gives you the reach of a full-length katana with a 27 cm handle that accommodates a solid two-hand grip without excess. The cotton ito (handle wrap) is wound tight over the same handle, providing grip texture that does not degrade with sweat or repeated use the way lacquered finishes can. The aohada (green bark wood) saya – the scabbard crafted from textured bark-surfaced wood – draws clean and seats firm. There is no rattle in the fit. When you draw, the blade clears without drag, and the mouth of the saya seats the habaki (blade collar) with the kind of pressure that tells you the fit was made right.

Care

After each use, wipe the blade down with a clean cloth and apply a light coat of choji oil (clove-scented mineral oil, traditional blade preservative) before sheathing. Store horizontally, edge up, in a low-humidity environment. Inspect the ito wrap periodically – if it loosens, have it re-wrapped before continued cutting use.