In a dilute air environment, how does flame color typically appear compared to clean air?

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In flame color, the presence of soot from incomplete combustion changes the hue. In a dilute air environment, there’s less oxygen available, so combustion tends to be fuel-rich and incomplete. This fosters soot formation, and those heated soot particles glow, giving the flame a yellow to orange appearance. The blue color, which indicates clean, complete combustion with minimal soot, would be more likely in oxygen-rich conditions, not in a dilute one. A white flame would suggest a very hot, cleaner burn that’s less typical when soot is abundant, and a colorless flame isn’t the usual outcome for a hydrocarbon flame under these conditions. So the yellow/orange color best matches the effect of reduced oxygen and increased soot formation.