What is blue samegawa and why is it used on tanto handles?
Updated Mar 2026
Samegawa is ray skin — specifically from the sting ray — that has been dried and prepared for use as a handle wrap underlayer on Japanese swords. On collectible tanto, the pebbly, nodule-covered surface of samegawa creates a visually striking texture beneath or alongside the cord wrap. Blue samegawa is dyed to achieve its deep indigo tone, a colorway that became associated with formal and presentation-grade sword furniture in Japanese aesthetic tradition. Beyond appearance, the raised nodules of the ray skin lock the cord wrap in place and prevent the handle layers from shifting, giving the grip a solid, unified feel even on display pieces that are regularly handled for examination.