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I've heard you can harden copper too.
The guy was telling me to heat it and let it cool slowly and it will harden it , IDK , I haven't tried it yet.
He said to soften it you quench it in water , just the opposite of steel.
I do know it work hardens , hit it with a hammer.
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American Bladesmiths Society Apprentice Smith
Work Smarter Not Harder
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