Cool Flame 2 : Flames existing in the vapor-air mixtures of most hydrocarbons and oxygenated hydrocarbons at temperatures below normal ignition temperature for the corresponding fuel
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}