How does the gray finish form on these blades?

 Updated Mar 2026

The gray tone on a melaleuca steel katana is not paint or powder coating - it develops naturally from controlled oxidation of the steel's iron content during heat treatment, combined with hand-polishing that brings the surface to a muted pewter luster rather than a mirror shine. Because the folded layers contain varying carbon concentrations, different areas of the blade absorb and reflect light at subtly different rates, giving the gray finish its characteristic depth and movement. This restrained, cool-toned surface is intentionally chosen to complement gold lacquer sayas and gilt tsubas, creating a visual contrast that collectors describe as classically balanced rather than ostentatious.

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