Generally, the blur color of a flame comes from molecules that are produced when the fuel is combusted. Normally, it is a hydrocarbon being combusted, and the CH and C2 molecules produce a green to blue light. As the fuel is being consumed and introduced to more oxygen, the color of the flame becomes more yellow.
Additionally, the introduction of certain metals will produce certain colors. For example, when copper is burned over a flame, the flame will become a greenish color. Temperature also plays a factor in the color of a flame. Higher frequencies (hotter temperatures) produce a bluer flame. On the other side of the visual spectrum, lower frequencies (lower temperatures) produce a redder flame.
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