What is a wave hamon and how is it created on these blades?

 Updated Mar 2026

A hamon is the visible temper line that appears along the edge of a differentially heat-treated blade. On the pieces in this collection, the wave hamon presents as a flowing, undulating line running the length of the edge, created by applying a clay coating to the spine before the hardening process. The clay insulates the spine, causing it to cool more slowly than the edge, which produces contrasting crystalline structures in the steel. On manganese steel, this process yields a hamon with good visual clarity. The wave pattern specifically β€” known as notare or midare depending on its regularity β€” has deep roots in classical Japanese blade aesthetics and remains one of the most recognized features collectors look for.

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