The terminal hermetic phase is the red 'rubedo' (see J. Evola 'La Tradizione Ermetica' sect. 21: "Conoscenza del Rosso") related to the secret fire or Kundalini, symbolized, among many images, as a serpentine fire from the sky as lightening or from the bowels of earth as the fiery breath of the dragon. Red and orange are also the colours of the rusted iron, and iron is the metal of the planet/god of the war, Mars ('La Tradizione Ermetica' quoted, sect. 24). In the ancient Rome the hero, hosted in the Temple of Hercules, wore a red gown and his face was tinted of red. Note that even in not-Aryan cultures, like the Egyptian, the planet Mars was called 'Horus the Red'.
As for the Christian hell's flames, quoted by 'darkiexx', watch how different was the Beyond in the Greek-Roman word in 'Revolt against the modern world', chapter. VIII: The two ways of the beyond. Those flames are probably only the counter-part of the 'red-hot' wounded heart of Jesus dropping the blood to drink at last supper in some sort of (cannibal-like?) echo of the ancient sacrifice of the King, in Latin environment the 'Rex Nemorensis' or King of the Wood ('Revolt' quoted, chapter. II: Regality).