What is the difference between the various colorful blade finishes available in this collection?
Updated Feb 2026
The colored blade effects - gold, blue, purple, and others - are achieved through different surface treatments applied to the carbon steel after forging and heat treatment. Blue and black blades are typically produced through oxidation treatments or specialized quench processes that alter the surface layer of the steel, producing a consistent color without affecting the core material. Gold blades often combine polishing with a light metallic surface treatment. Purple and other accent colors use similar oxidation or coating approaches. These treatments are primarily aesthetic and do not significantly affect the structural properties of the underlying blade - the carbon steel beneath remains unchanged. From a care perspective, treated blades require the same basic maintenance as any carbon steel katana: keep them dry, wipe after handling, and apply a light oil coat periodically. The surface treatments may show light wear at contact points over time, particularly around the habaki, but this is normal and does not compromise the blade itself.