Thanks Jeanette and Steve.
Quote:
Originally Posted by multiweb
Quick question Steven: the very tip seems to be darker as if (heat) tempered or of different composition?
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Marc I'd say the blue colour is due to the tempering process.
Since the entire needle is tempered the question is why the needle isn't blue overall? Perhaps since there is less metal at the tip it has reached the required temperature to turn blue.
I'm sure any metallurgists out there can provide an explanation.
Regards
Steven