Temper at 425 F

After the blade is worked to 600 grit, place in a kiln at 425 F until the blade becomes a light straw colour. This process removes some carbon atoms from the centre of iron crystal and places them on the face of the crystal making the steel 'softer'. Watch the blade carefully since if it turns dark brown or even purple you have lost the hardness and you must repeat the hardening.

John Jamieson, Danny Kavik

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