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There are quite a few different names for clay tempering, such as selective tempering, zone treating, or differential hardening, but most commonly it's known as differential tempering. Regardless of the name used, it refers to the way the blade is heat treated to have a strong cutting edge and a soft, springy spine. There are several ways of achieving this effect on swords, each meant for different situations.How does the process work?The process is called heat treating in general, when a piece