How is the hamon on a T10 katana formed?

The hamon on a T10 katana is produced through differential clay-tempering, a process where the bladesmith applies a thick layer of insulating clay along the spine before the final quench in water or oil. The exposed edge cools rapidly, hardening into martensite, while the clay-covered spine cools slowly and remains relatively soft and resilient. The boundary between these two crystalline zones — visible as a misty, undulating line along the blade — is the hamon. Because the clay is applied by hand, the pattern varies between individual blades, meaning no two T10 katana share an identical hamon. This natural variation is part of what makes each piece genuinely collectible.

How does a Blue 1060 katana differ from a Blue 1095 katana?

Updated Mar 2026

The primary difference lies in carbon content and the properties that follow from it. 1095 steel, with approximately 0.95% carbon, can be hardened to a higher Rockwell hardness rating and tends to produce a more pronounced hamon - the temper line along the blade edge - which many collectors consider visually striking. However, higher hardness also means slightly less flex tolerance. The 1060 steel in this collection prioritizes resilience and long-term dimensional stability, making it a slightly more forgiving material for display pieces that may occasionally be handled or test-cut under supervised conditions. Both share the same signature blue finish aesthetic; the choice between them often comes down to whether a collector prioritizes edge definition or overall structural durability.