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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.
Answer 1: Blue flames come from very hot, complete burning of air and fuel. Orange color comes from cooler spots in the flame where fuel isn't being totally burned and these produce a little bit of soot and smoke. The color of the flame is related to the heat of the flame. Think about the colors of different hot things: the Sun is white or yellow, a hot stove is red, a camp-fire is orange, and a gas flame is usually blue. These colors come from different kinds of a light and different places in the electromagnetic spectrum.