red fire

noun
any of various combustible preparations, as one containing strontium nitrate, that burn with a vivid red light: used chiefly in pyrotechnic displays and in signaling.

Origin:
1810–20

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World English Dictionary
red fire
 
n
any combustible material that burns with a bright red flame: used in flares and fireworks. The colour is usually produced by strontium salts

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
He drove a converted red fire truck stocked with medieval-looking tools.
Whether it was the yellow streetlights, the cross lights at the intersections,
  or the color of the red fire hydrant.
Nearby, in a storage room beside the vault, an ordinary-looking red fire
  extinguisher was strapped to the wall.
It may be displaced from established habitats by the red fire ant.
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