Ha :The Ha may be the cutting edge in the blade. It is this part that is normally hardened Using the Hamon in the standard way. The sharpening of this portion plus the hardening as well as steels utilised will establish the quality of the sting, but additionally its rigidity https://beckettxusnk.blogsumer.com/27011982/not-known-factual-statements-about-handforged-katana-sword