However, new swords including the old swords after the Muromachi period, and the very new sword claimed to be a sword from the Kamakura period, can be detected by its material, iron and figure.
但し、室町期以降の古刀を含む新刀、新々刀を鎌倉期の刀に見せかけたもの等は地鉄、姿から看破できる。