Katana making. The secret of making a Japanese sword. Kamakura style tachi production.

Katana making. This time we will make a tachi blade. in the style of the Kamakura period. We are experimenting with the structure of steel. Therefore, we will use three types of traditional steel with a high carbon content. Tamahagane, Oroshigane and cast iron. After the folding process, we build the packet in the orikaeshi san mai construction. Then we forge the blade and darken it. At the end, the process of structural grinding and polishing of the window to check the steel and the hamon line.