Shirogami Steel Guide
Sep 27, 2026
Shirogami, often called White Paper steel, is a family of high-purity Japanese carbon steels from Yasugi Specialty Steel. Proterial describes the family as carbon steel with minimum impurities, with different grades designed for different hardness levels and tool applications.
Why is it called White Paper steel?
The name comes from the white paper used historically to identify the material grade, not the appearance of the finished blade.
Shirogami #1, #2 and #3
Proterial lists Shirogami #1 as the highest-hardness grade in the family, #2 as high hardness and #3 as middle hardness. In kitchen knives, the maker’s heat treatment and blade geometry remain just as important as the number.
Why do sharpeners like Shirogami?
Its relatively simple, clean carbon-steel composition can feel very direct on whetstones and can take a fine edge. That does not mean every Shirogami knife is easy to sharpen: hardness, grind and damage still matter.
Does Shirogami rust?
Yes. It is reactive carbon steel. Patina is normal; orange or red rust is not. Wash by hand, dry immediately and store dry.
Shirogami vs Aogami
Shirogami has a simpler carbon-steel concept, while Aogami adds alloying elements to improve wear resistance and heat-treatment properties. Neither is universally better.
Who is it for?
Shirogami is attractive to cooks who value simple carbon steel, fine sharpening response and traditional knife construction and who accept the need for corrosion care.
See Aogami vs Shirogami, Japanese Knife Steel Guide and Patina on Carbon Steel.
