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The colour of a piece of steel may be used as a guide to it's temperature. These are particulalrly useful when hardening or tempering steel.
|Brown to purple||266|
|Just visible red||500 to 600|
|Dull cherry red||700 to 750|
|Cherry red||750 to 825|
|Bright cherry red||825 to 875|
|Brightest red||900 to 950|
|Orange||950 to 1000|
|Light orange||1000 to 1050|
|Lemon||1100 to 1200|
|White||1200 to 1300|