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I deal with so many human beings and relative temperatures I missed the obvious about metals exposed to cold. Metals don't feel the temperature, they would only cool quicker in the wind.
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At it's heart, the purpose of the process of folding and welding, no matter the cultural traditions, is to render a raw steel bloom into a clean workable billet of material without sand, charcoal,...

As much as we know now about pattern welding and the activity of carbon migration in steel at temperature, in this modern age, this idea is a false one, despite being the basis for much of the myth...

You've all contributed a variable in the problem. King2011 this is a very good question.

The first thing we'd have to know is the original hardness of the blade(s) to be examined. Rockwell...