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Old 24th July 2007, 08:26 PM   #12
kai
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Join Date: Apr 2005
Posts: 3,213
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Hello Josh,

Quote:
I have seen a lighter area at the forte of a blade on a Chinese dao that Philip Tom attributed to annealing. The idea was to reheat the base of the blade and let it cool slowly to increase durability at the expense of hardness in an area where hardness is not as important.
Thanks for the nice observation! Maybe this would be preferable to do before attaching the gangya; it seems safe to assume that the latter was also annealed for ease of working and toughness.

The only other explanation which comes to my mind would be quenching almost the whole blade in some fluid...

Regards,
Kai
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