<P> The reducing flame is the flame with low oxygen . It has a yellow or yellowish color due to carbon or hydrocarbons which bind with (or reduce) the oxygen contained in the materials processed with the flame . The reducing flame is also called the carburizing flame, since it tends to introduce carbon into the molten metal . </P> <P> The neutral flame is the flame in which the amount of oxygen is precisely enough for burning, and neither oxidation nor reduction occurs . A flame with a good balance of oxygen is clear blue . </P> <P> The reducing and neutral flames are useful in soldering and annealing . </P>

Which types of flames are desirable while welding