How does clay tempering create a visible hamon on T10 steel?

 Updated Feb 2026

Clay tempering involves applying a layer of clay mixture of varying thickness along the blade before the quenching process. The spine, coated more thickly, cools slowly and remains relatively soft and resilient, while the edge, thinly coated or left bare, cools rapidly and hardens. The boundary between these two zones produces the hamon — a visible temper line that appears as a misty, wavelike pattern along the blade after polishing. T10 tool steel is particularly well suited to this process because its high carbon content responds dramatically to differential hardening, producing a distinct and attractive hamon. Each clay application is done by hand, so no two hamon lines are identical, making every blade a one-of-a-kind collectible.

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