What makes a Nodachi different from a katana or tachi?

The defining characteristic of a Nodachi is blade length. While a katana typically measures between 24 and 30 inches and a tachi around 27 to 31 inches, a Nodachi must exceed approximately 35 inches of blade to earn the designation. Historically, that extra length meant the sword could not be drawn from the hip like a katana — it was either carried across the back, drawn by an attendant, or simply carried unsheathed. The handle is also proportionally longer to allow a wide two-handed grip. In terms of construction lineage, the tachi and Nodachi share a similar deep curvature and suspension style with the edge facing downward, but the Nodachi pushes every dimension to a larger scale. For collectors, the practical difference is a dramatically more imposing display presence and a forging process that requires greater skill to maintain consistent temper across such a long blade.

How can I tell if a hamon on a katana is real or artificially etched?

A genuine hamon forms during the quenching process as the differential hardness between the edge and spine creates a crystalline transition zone called the nie and nioi layer. Under natural raking light - not overhead fluorescent - a real hamon shows internal activity: cloudy mist-like patches (utsuri), small bright crystals (nie), and an irregular, organic boundary that shifts in appearance as the viewing angle changes. An acid-etched or machine-ground pseudo-hamon, by contrast, looks flat and consistent regardless of light angle, with a hard boundary that has no interior texture. On the T10 clay-tempered pieces in this collection, the hamon is formed through genuine differential hardening, meaning the visual activity you observe is a direct record of the heat treatment process - making each blade's hamon line uniquely its own.

How should I maintain and store a Damascus steel katana?

Damascus steel requires more attentive care than stainless steel because its carbon-bearing alloys are susceptible to oxidation. After handling, apply a light coat of choji oil or a food-grade mineral oil to the blade surface using a soft, lint-free cloth, paying attention to the etched texture where moisture can settle. Store the katana horizontally on a display stand or in its saya with the edge facing upward, in a climate-controlled environment away from direct sunlight and humidity fluctuations. Avoid storing blades in leather sheaths for extended periods, as leather can trap moisture. Inspect the blade every few months, especially in humid climates, and re-oil as needed. The saya itself — whether lacquered hardwood or rosewood — should be kept away from extreme dryness that could cause the wood to crack or warp.

How should I store and maintain a white saya katana in a collection?

White lacquer saya are more susceptible to UV yellowing and surface scuffing than darker finishes, so storage away from direct sunlight and fluorescent light is advisable. For the blade itself, a light application of choji oil or a neutral mineral oil every few months prevents surface oxidation — use a lint-free cloth and apply sparingly, then wipe away any excess. When sheathed for storage, ensure the blade is dry and clean before inserting into the saya; any trapped moisture will accelerate rust along the edge. If the sword is displayed horizontally, orient it with the edge facing upward in the traditional katana-kake manner, which reduces stress on the habaki and prevents the blade from resting on the saya lining.

How does a naginata differ from other Japanese bladed polearms?

Updated Mar 2026

The naginata is defined by its long wooden or wrapped shaft paired with a single-edged, curved blade mounted via a tang and secured with a collar called a habaki. Unlike the yari, which carries a straight symmetrical spear point, the naginata's blade has a pronounced curve and a distinct cutting edge, making it closer in profile to a mounted katana blade. The nagamaki, another related form, features a longer handle relative to its blade and was typically associated with mounted use. The naginata's proportions — generally emphasizing a longer shaft and a moderately sized blade — give it a distinctive silhouette that has made it a recognizable and sought-after form for Japanese arms collectors.