is fire always the same temperature?
temperature at which a liquid fuel produces sufficient vapors to support combustion once the fuel is ignited. fire point must exceed 5 seconds of burning duration during the test. the fire point is usually a few degrees above the flash point.
The colder part of a diffusion (incomplete combustion) flame will be red, transitioning to orange, yellow, and white as the temperature increases as evidenced by changes in the black-body radiation spectrum. For a given flame's region, the closer to white on this scale, the hotter that section of the flame is.