Soldering at a red heat by means of spelter is called brazing.
One hemisphere, forever in sunshine, remained in a low, red heat.
Marjorie's friendship for Chrissie Lang at present flamed at red heat.
Accordingly one method of demagnetizing a magnet is to raise it to a red heat.
Place the end just finished in the fire and heat to a red heat.
This agrees with what I had ...