Step 2) Sword making
Tanren / tempering
The iron pieces, still piled onto spatula, are then heated in the fire. The iron is repeatedly heated and pounded until the desired degree of steel is obtained. This process determines the quality of iron. pounded with the help of lye (an alkaline solution, often used for washing or cleansing), the iron becomes purer and stronger, turning to steel.
Shingane & Hi-zukuri / forming
Two separate pieces of the finished steel are fitted together to form the core and skin of the sword. Repeated pounding molds the steel into a bar which the master then shapes into a rough blade with a special shaver and fields .
Tsuchioki & Yaki-ire / shaping
A coating of clay is applied to the blade. Read More