Why are the fittings on these tachi described as bronze?
Updated Feb 2026
The fittings — tsuba, fuchi-kashira, menuki, and other accent hardware — are cast from copper-based alloys that produce a warm, golden-brown finish reminiscent of historical bronze sword furniture. Copper alloy is favored for decorative koshirae because it accepts fine casting detail, allowing intricate motifs like chrysanthemums and peonies to retain crisp lines. Over time the surface develops a natural patina that deepens the visual warmth, which many collectors find desirable. Unlike plated finishes, solid copper-alloy fittings maintain their character even with decades of display.