The Ethics of Polishing — Deciding When to Repolish a Sword

Japanese sword polishing is not merely cosmetic work. Togishi (polishers) use traditional stones and advanced skills to reveal blade texture, hamon, and kissaki shape, effectively performing "sword restoration and preservation." However, polishing removes metal, and once removed it cannot be replaced. Polishing thus carries contradictory aspects: restoring beauty while shortening the blade's lifespan.

Consequently, owners, polishers, and appraisers often debate whether to polish a particular sword — an ethical question, not merely a technical one. This article explores modern thinking about polishing and criteria for deciding when to repolish.

What Polishing Is — Between Cosmetics and Restoration

Japanese sword polishing has two major stages. Foundation polishing (shitaji-togi) progresses from coarse to fine stones, accurately shaping the blade's ground and hamon. Finish polishing (shiage-togi) uses traditional stones like Narutaki, Uchigumori, Hazuya, and Jizuya to draw out hamon tones and jigane landscape. Even skilled polishers require 1–3 months; fees range from hundreds of thousands of yen to millions for Important Cultural Property-class work.

Polishing is not cosmetic but restorative, returning the blade to its proper appearance. Yet each polishing slightly reduces blade width and mass. Repeated polishing erodes even great masterpieces over time.

Criteria for Deciding Whether to Polish

When considering whether to polish an owned sword, weigh these points.

1. Severity of Rust

Light rust or clouding can be addressed by routine care (uchiko and oil). Deeper rust obscuring hamon and jigane observation warrants considering polishing. However, rust reaching structural depth may leave traces even after polishing.

2. Time Since Last Polish

Recently polished blades rarely need repolishing. Each polish removes a fraction of a millimeter to a full millimeter, so frequent polishing should be avoided. With proper routine care, polishing once every few decades is generally sufficient.

3. Cultural Property Value

Important Cultural Property or Important Art Objects require especially careful judgment. These are cultural heritage for future generations, not mere personal possessions. Consultation with cultural affairs agencies, specialist organizations, and renowned polishers is essential.

4. Purpose After Polishing

"Display," "Pre-sale preparation," "Generational inheritance" — purpose changes the calculation. For sale, appearance-focused polishing may be chosen; for long-term inheritance, preserving blade mass may be wiser.

Choosing a Polisher

When commissioning polishing, polisher selection is decisive. Ideally choose technicians affiliated with the Japanese Sword Polishers Association, heirs to famous lineages (Hon'ami, Fujishiro), or Important Intangible Cultural Property holders — those with established track records and tradition.

Different polishers have different specialties. Some excel at drawing out the subtle hamon of koto blades; others specialize in vivid treatment of shinto and shinshinto hamon. Matching polisher to blade era and style yields the best results.

Modern Polisher Dilemmas

Today's sword polishers carry heavy responsibility as inheritors of tradition. Recent debates include:

Supply-demand imbalance: Surging international collector demand keeps polishers constantly busy. Maintaining quality while meeting deadlines is challenging.

Short-term beauty vs. long-term preservation dilemma: Clients want "more beautiful," while polishers want to protect blades by "not over-removing."

Skill transmission and successor training: Becoming a polisher requires at least 10 years of apprenticeship, making it difficult to attract new entrants.

Before Sending for Polishing

Finally, points for owners to verify. Consider whether polishing is truly necessary or if routine care suffices. Clarify the purpose (display, inheritance, sale). Carefully select a trusted polisher and discuss approach in advance. Ultimately request work that does not harm cultural property value.

Polishing is a technique that revives swords but also removes material. A single owner decision shapes a sword's next several centuries. Understanding this weight and deciding with respect — that is the responsibility of those who carry Japanese swords into the future.