Mokume Gane is a technique of Japanese origin in which layers of alternating colors of precious metals are fused, forged and patterned to create swirling images of color in a sheet of metal. Mokume (wood eye) Gane (metal) is derived from the ancient Japanese sword making technique wherein layers of mild steel and carbon steel were forged together to create blades of great strength and durability. A fine woodgrain pattern on a blade is the tell-tale sign of Damascus steel.