1) Glowing state 2) Schwarzenegger film
Found on
https://www.crosswordclues.com/clue/red-heat
The practice of using colours to determine the temperature of a piece of (usually) 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. ==Chap...
Found on
http://en.wikipedia.org/wiki/Red_heat
No exact match found.
