Bunsen burner vent. The vent (centre) is in its open position, drawing air into the combustion mixture. This leads to a stronger, hotter flame, with a blue colour, rather than a yellow flame. Bunsen flames of different intensities are used for different heating methods during chemistry experiments. This bunsen burner is designed to use liquid propane as a source for propane gas as its fuel (indicated by the L.P. GAS label). The Bunsen burner was invented by the German chemist Robert Bunsen (1811-1899).