why is luminous zone yellow
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The flame is yellow because of its temperature. To produce enough soot to be luminous, the flame is operated at a lower temperature than its efficient heating flame (see Bunsen burner). The colour of simple incandescence is due to black-body radiation.
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Luminous zone is the zone of incomplete combustion and moderately hot. The wax values do not burn completely as the supply of oxygen is inadequate.
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