白紙1号

Shirogami #1

White Paper Steel #1

Pure high-carbon steel with minimal impurities. Takes a laser-like edge and is easy to sharpen, but more brittle than Aogami. The traditional choice of master woodworkers who demand the finest possible cutting edge and sharpen their tools with religious dedication. Rust forms overnight if neglected.

Performance Characteristics

Sharpness10/10

Edge Retention7/10

Ease of Sharpening9/10

Rust Resistance2/10

Chemical Composition

carbon1.25–1.35%

Technical Data

Hardness62–65 HRC HRC

Heat TreatmentVery precise — very narrow window

Primary UsePremium plane blades, paring chisels

ManufacturerHitachi Metals (now Proterial)