what kind of clay is used in the process, also i live tennessee and there is an abundance of red clay there but when i use it in the forge it just pops off of the blade any answers to why would also help thankyou
To maximize both the cutting edge and the resilience of the sword spine, the technique of differentiated tempering, first found in China during the first century BC, is used: the sword is heated and painted with layers of clay—the mixture being closely guarded trade secrets of the various smiths, but generally containing clay and coal ash as the primary ingredients—with a thin layer or none at all on the edge of the sword ensuring quick cooling to maximize the hardening for the edge, while a thicker layer of clay on the rest of the blade causing slower cooling and softer, more resilient steel to allow the blade to absorb shock without breaking.
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