What does "folded steel" mean in a katana's construction?

Folded steel refers to a forging technique in which the steel billet is repeatedly heated, hammered flat, and folded back on itself — sometimes dozens of times. Each fold doubles the number of layers, refining the grain structure and working out air pockets and inconsistencies in the raw steel. Historically, this process was used in Japanese swordsmithing to improve steel quality when the raw materials were inconsistent. In modern collectibles, it serves both a functional and aesthetic purpose: the folding creates a visible grain pattern on the polished blade surface, called the hada, which is considered a mark of craftsmanship. Pieces in this collection that feature folded construction will typically note the layer count or the folded designation in their specifications.

What is the best way to store a katana on display long-term?

For long-term display, a katana should be stored horizontally on a dedicated katana stand, ideally with the edge facing upward in the traditional Japanese manner. Avoid environments with high humidity or direct sunlight, as both accelerate oxidation on the blade and can degrade lacquer finishes on the saya over time. Every few months, apply a thin, even coat of choji oil or a comparable mineral oil to the blade surface using a soft lint-free cloth, then buff lightly to prevent buildup. Before oiling, remove any existing oil with a clean pass using uchiko powder if available, or simply a dry cloth. Keep the blade away from bare hands during handling — the acids in skin oils initiate rust spotting faster than most environmental factors. For pieces with blue ito or sageo, avoid prolonged compression against hard surfaces, which can permanently flatten the cord's texture.

How does T10 steel differ from 1060 or 1045 in these katana?

T10 carbon steel is a high-carbon tool steel with a small amount of silicon added to improve hardness retention and wear resistance. When clay tempered, T10 produces a genuine hamon - the visible temper line along the blade - making it the most visually and technically complex option in this collection. 1060 carbon steel sits at a mid-range carbon content, offering a reliable balance of edge quality and resilience, commonly chosen for display swords that still benefit from a properly heat-treated blade. 1045 carbon steel has a slightly lower carbon content, making it easier to work and a solid entry point for collectors focused primarily on the mountings and overall presentation rather than steel performance specifics. Each grade results in a distinctly different blade appearance and surface finish.

How does a tachi differ from a katana in shape and mounting?

The tachi predates the katana by several centuries and was designed primarily for use on horseback. Its blade is generally longer - often exceeding 70 cm - and carries a more pronounced curvature measured from the base rather than the center of the blade. Historically, the tachi was suspended edge-down from a cord at the hip, which is why many tachi fittings, including the tsuba and habaki, are oriented differently from their katana counterparts. The katana, by contrast, is worn edge-up through the obi. For display purposes, the tachi's deeper curve and longer saya create a dramatically different visual profile when mounted horizontally on a sword stand, giving collectors a silhouette that reads as distinctly classical and pre-Edo in character.

What is the difference between a katana and a tachi long sword?

Updated Feb 2026

The katana and tachi differ in curvature, wearing method, and historical period. The tachi originated in the Koto period (before 1596) and has a deeper, more pronounced curvature along the blade, with the maximum curve point closer to the handle. It was worn suspended from the belt with the cutting edge facing downward, designed for a sweeping draw while on horseback. The katana evolved during the Muromachi period with a shallower curvature and was thrust through the belt with the edge facing upward, optimized for a fast draw from a standing position. In a display collection, the tachi offers a more dramatic visual profile while the katana presents the more iconic and widely recognized silhouette.