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Here are individual colors for a rainbow of fire, for flame colors from red to violet... 1  Red Fire. 2  Orange Fire. 3  Yellow Fire.  Green 1  Fire. Blue Fire.  Violet Fire.
The yellow color is due to small particles of soot being burned to incandescence. If we need. a hotter flame, which is usually the case, we would need to introduce more oxygen, by. mixing more air with the methane gas before combustion. The hotter the flame, the bluer it. gets.