Sharpening & Maintenance

Sharpening is the single largest ongoing cost of owning professional scissors. A well-maintained pair can last a decade or more, but only if the sharpening method matches the blade geometry. The wrong technique destroys the edge profile the manufacturer designed — and no amount of re-sharpening can recover it.

Convex vs beveled: different edges, different methods

The most important distinction in scissor sharpening is the edge type:

• Convex (ハマグリ刃 / hamaguri-ba): A smooth, continuous curve ground into the blade face. Requires hand sharpening on a flat abrasive disc or lapping film. Machine grinding will destroy the designed radius.
• Beveled (段刃 / dan-ba): A defined angle at the cutting edge. Can be sharpened by machine (e.g., Wolff system) or by hand. More forgiving of sharpening variation.

Sending convex scissors to a machine sharpener is the most common — and most expensive — mistake stylists make. Always confirm the sharpener’s method before handing over your tools.

How to evaluate a sharpener

1. Ask what system they use and whether they handle convex edges
2. Ask how they test the edge after sharpening (tissue paper test, hair test)
3. Ask if they inspect and adjust tension, alignment, and pivot condition
4. Check whether they are certified by any manufacturer (e.g., Mizutani, Hikari, HSC)

A good sharpener restores the scissor — a bad one shortens its life.

Typical costs

Sharpening methods

• Hand Sharpening (手研ぎ) — the gold standard for convex edges
• Machine Sharpening (機械研ぎ) — fast and consistent for beveled edges
• Water Stone Sharpening (砥石研ぎ) — the traditional Japanese method
• The Togishi Craft (研ぎ師) — professional scissor restoration as a discipline

Sources

• HSC — Manufacturer Sharpening Column メーカーによるシザーの研ぎ (Japanese)
• Scissors Yamato — Sharpening Specialist 理美容ハサミ研ぎ専門店 (Japanese)
• Bitsuhan — Sharpening Service Network 研ぎ屋 (Japanese)
• Mizutani Scissors — Press / Certified Sharpener Program (English)