REDHEAT

Red heat

The practice of using colours to determine the temperature of a piece of ferrous metal comes from blacksmithing. Long before thermometers were widely available it was necessary to know what state the metal was in for heat treating it and the only way to do this was to heat it up to a colour which was known to be best for the work.

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red heat

Noun

  1. The condition of being red-hot
  2. The temperature of something that is red-hot


The above text is a snippet from Wiktionary: red heat
and as such is available under the Creative Commons Attribution/Share-Alike License.

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