Blacksmith puts on anvil billet a hot metal and begins to strike. A piece of metal red hot and white, yellow, in place where it is less hot it color red. Master put it on a small incus and holds with one hand, second dealing accurate blows with a heavy hammer flat. Under his blows iron begins to take desired shape, in this case, it elongates and thins. From this sparks fly, but blacksmith is protected from them by a dense apron.