The non-luminous zone of a candle flame is the _______________part of the flame.
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Lower,,,,,,,,,,,,,,, Blackish
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3. The outermost zone: The outermost zone also known as non-luminous zone is the zone of complete combustion. The ample presence of oxygen (or air) aids in complete combustion. It is the hottest zone of the candle flame and does not produce much light. It is blue in colour.
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