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Tempering colors

Hi, I have a question about tempering colors. I understand that the
colors give a visual indication of how far the temper has been drawn,
but why do those colors occur? Does it have something to do with
oxidation?
Reply to
Bernie.Shea
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Tempering steel by color is an old time method - but it's not very precise. The surface film thickness grows with temperature, and provides a color tell tale via an interference effect - like oil film color on water.
Brian Whatcott Altus OK
Reply to
Brian Whatcott

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