What makes a hamon on a T10 tanto genuine vs. etched?

 Updated Mar 2026

A genuine hamon forms during clay tempering, when the blade is coated with differential clay, heated, and quenched. The clay insulates the spine, causing the edge to cool faster and harden at a higher level - the hamon is the visible boundary between these two zones. It will show activity, nie (crystalline granules), and natural irregularity when examined under light. An etched or acid-washed hamon, by contrast, is applied after the fact to mimic the appearance without the underlying metallurgical change. On a T10 tanto in this collection, the hamon is the result of the actual tempering process, meaning it reflects real differential hardness along the blade - a meaningful distinction for collectors who value authenticity over cosmetic appearance.

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