Tamahagane vs Shirogami #1

Detailed metallurgical comparison between Jewel Steel and White Paper Steel #1.

TAMAHAGANE

Tamahagane

Jewel Steel

The legendary steel produced by smelting iron sand (satetsu) in a traditional tatara furnace over three days. The bloom contains steel at varying carbon levels, which a swordsmiths then separates by eye. For tool use, the finest pieces are laminated into a hard hagane cutting edge. Represents the absolute summit of Japanese metallurgical tradition — both material and art object.

carbon0.60–1.50% (varies through bloom)
Sharpness
10
Edge Retention
8
Ease of Sharpening
9
Rust Resistance
2
SHIROGAMI-1

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.

carbon1.25–1.35%
Sharpness
10
Edge Retention
7
Ease of Sharpening
9
Rust Resistance
2