What is the luminous part of the candle and why ? Share with your friends Share 0 Sriram B answered this The flame because it is fire which emits infrared radiation which is form of heat and light(luminosity). -1 View Full Answer Mansi answered this ijxcvsoigdsd -1 Rajveer Kaur answered this middle zone of the candle is called luminous zone 2 Saksham answered this MIDDLE OF THE CANDLE -1 Saksham answered this WERGWERHGWE H -1 Vivek Pawar answered this What is rust ? 0 Raj Sen answered this Vhkghklvj 0 Prabal Krishna Sarania answered this The middle zone is yellow and luminous. As it is an oxygen depleted zone, insufficient oxygen exists to burn all of the wax vapor. As such, partial combustion of wax takes place. The zone also contains unburnt carbon vapor. 1