Japan's hand-forged knives a slice of samurai metallurgy

Blacksmith Yoshihiro Yauji pulls a piece of glowing metal from the forge in a Japanese village, continuing a tradition dating back centuries to when the region was renowned for crafting swords carried by samurai.

He places the steel under a spring hammer and the sound of the metal being flattened and fortified into a kitchen knife echoes off the mountains surrounding the workshop.