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Is it possible to make a blade stay blue after quenching? I just watched a video that showed Tony Swatton heat treat a sword made out of 5160 spring steel to a blue temper and then when the sword was completely finished it was still that same blue color. I am new to blacksmithing and the heat treating process but from all my research I did not think that was possible. So my question is is it possible? and if it is how is it done? The part in question is at 3:58