Katana Obsidian Wave Oroshigane Kobuse Blade Kuronami Koshirae 黑浪 Fashi are engraved with wave patterns（波文）

are engraved with wave patterns（波文）

This Katana (打刀) features a blade forged from in-house refined Oroshigane (卸し金) steel in Kobuse-zukuri (甲伏造) construction — a hardened outer jacket surrounding a softer core

The surface reveals a refined masame-hada (柾目肌) grain

with countless golden-orange specks creating a luminous and textured brilliance

The Mokume fuchi-kashira set is crafted from white copper and features a finely carved wood-grain texture that flows continuously across both the fuchi and kashira

Katana Obsidian Wave Oroshigane Kobuse Blade Kuronami Koshirae 黑浪 Fashi are engraved with wave patterns（波文）Folded Oroshigane Steel Shinken () Obsidian Wave Katana: TangGu () Oroshigane () Kobuse Blade () + TangGu () Kuronami Koshirae () This uchigatana () has a blade forged from in house refined Oroshigane () steel in Kobuse zukuri () construction, with a hardened outer steel shell around a softer core the same method used in tamahagane blades to achieve both strength and resilience. Traditional folding produces a mixed Mokume hada and Masame hada ()