How are blue flames created?

Blue flames are created when a fuel, such as natural gas, burns completely with a sufficient supply of oxygen. This complete combustion results in a higher temperature and a cleaner burn, producing a blue hue due to the emission of specific wavelengths of light. The presence of certain compounds, like methane, can also contribute to the blue color. In contrast, yellow or orange flames typically indicate incomplete combustion, where soot particles are present.