A candle is simply a solid cylinder of tallow, wax or other solid fat, containing a wick to give off light when burning. When the wick is lit, the flame radiates sufficient heat to melt a small pool of wax at the top of the candle. The liquid wax is then drawn up the wick by capillary action into the flame where it is vaporized and burnt. The main purpose of the wax is to provide the fuel for the flame so the burning characteristics of the wax are extremely important. A good candle burns steadily, lasts for a long time, produces very little smoke and gives a good quality light.