Nichirin swords will also change colors when held by different people. The blade which Tanjiro and Tokito discovered in the Yoriichi Type Zero, for example, didn't turn sky blue like Tokito's ...

It has been said that the samurai's sword was his soul ... the katana's two different types of steel gave it optimum qualities for both, making it a highly versatile weapon in battle.

He analyzes the one-handed sword fighting moves in "Avengers ... He explains why samurai employed different types of spears in battle in "Shogun." He breaks down the differences between samurai ...