What Is a Togishi? 研師 — The Japanese Sword Polisher
A togishi (研師) is a trained Japanese sword polisher — the licensed craftsman who restores a blade's geometry and reveals its hamon and hada through a long sequence of hand-lapping stages on graded natural stones. Far more than sharpening, togi (研ぎ) is the art that makes a nihonto legible: it shapes the lines, brings out the temper line and grain, and finishes the surface so that everything the smith built into the steel can finally be seen. A great polish can reveal a masterpiece; a bad one can destroy it forever.
For a collector the togishi is the single most important person after the smith. Whether a blade is worth a modest sum or a fortune often comes down to the quality of its polish and whether that polish was done by a qualified professional. Understanding what a togishi does — and why an amateur must never touch a blade — is essential buyer knowledge.
What the togishi actually does
Polishing a Japanese sword is a restoration of both form and revelation of detail. The togishi corrects the sugata (姿) — the geometry of the shinogi (鎬), the ji, and the kissaki — removing the minimum steel needed while re-establishing crisp lines. Only then does the finishing work draw out the hataraki: the hamon (刃文), the jigane, and the grain of the hada (肌).
The work proceeds through graded stages, each stone finer than the last:
- Arato (荒砥) — the coarsest foundation stones, used to correct shape and remove deep damage or old scratches.
- Uchigumori (内曇) — fine natural stones that begin to bring up the hamon and the grain of the steel.
- Hazuya (刃艶) — thin uchigumori slivers worked over the edge to whiten and define the temper line.
- Jizuya (地艶) — thin stones worked over the ji to reveal the jigane and the hada.
- Nugui (拭い) — a fine metallic powder wiped over the surface to darken the ji and set the contrast.
- Hadori (刃取り) — the final cosmetic finish that whitens and shapes the appearance of the hamon along the edge.
Each stage builds on the last, and a mistake early on cannot be undone later — steel removed is gone for good.
Why only a qualified togishi should ever touch a blade
This is the most important thing a buyer can learn. A Japanese sword is a finite object: every polish removes a little steel, and there is only so much steel to lose before the blade is ruined. A professional togishi removes the absolute minimum and preserves the blade for the next generation. An amateur — or someone using sandpaper, buffing wheels, or Western sharpening tools — does catastrophic, irreversible harm.
- It destroys the hamon and hada. Buffing wheels and abrasive paper flatten the surface and erase the very features that reveal the smith and school.
- It ruins the geometry. Rounding the shinogi or the kissaki, or thinning the blade unevenly, permanently degrades the sugata and the value.
- It collapses the value. A blade with an amateur polish can lose most of its worth overnight, and no professional re-polish can restore the steel that was lost.
- It cannot be reversed. Unlike a scabbard or fittings, the blade itself is irreplaceable — there is no undo.
The single most valuable rule for any owner: never clean, sharpen, or "polish" an antique nihonto yourself. Light rust or scratches are a job for a professional togishi, never for a home remedy.
Polish, condition, and value
Because a good polish is expensive and takes many days of skilled labour, blades are often sold "in old polish" or with light sabi (錆), rust, and minor kizu (疵). A buyer must weigh the cost of a professional re-polish against the blade's potential — and understand that some flaws, such as hagire, cannot be polished away and are fatal regardless of who does the work.
When you view a blade, ask who polished it and when. A recent, competent togi by a recognised togishi is a mark of care; a hazy, scratched, or amateur-buffed surface is a warning. The polish is not a detail — it is the difference between seeing the sword and seeing a ghost of it.
Frequently asked questions
What is a togishi?
A togishi (研師) is a trained Japanese sword polisher who restores a blade's geometry and reveals its hamon and hada through a sequence of hand-lapping stages on graded stones. It is a specialised craft distinct from ordinary knife sharpening.
Can I polish my own Japanese sword?
No. Amateur polishing with sandpaper, buffing wheels, or Western tools causes irreversible damage — it erases the hamon and hada, ruins the geometry, and can destroy most of the blade's value. Only a qualified professional togishi should ever polish an antique nihonto.
How does a togishi bring out the hamon?
Through the finishing stages — uchigumori, hazuya, jizuya, nugui, and hadori — the polisher works progressively finer stones and powders over the edge and ji to reveal the temper line and grain the smith built into the steel.
Does polishing reduce a sword's value?
A skilled professional polish preserves and often increases value by revealing the blade properly, while removing only the minimum steel. Amateur or over-aggressive polishing does the opposite and can permanently collapse the value.
Keep exploring nihonto
- Hamon — the temper line a polish reveals
- Hada — the grain of the steel brought out in polishing
- Sabi — rust a togishi treats, and what you must never touch yourself
- Kizu — flaws that polishing may or may not remove
- Japanese Sword Glossary — every nihonto term explained