The component of gunpowder that creates the smell of rotten eggs when fired is sulfur. Gunpowder is a mix of three different components - potassium nitrate, charcoal and sulfur. Gunpowder has a flash point of approximately 801 to 867 degrees Fahrenheit.
Gunpowder is also known as black powder. It was invented in China when Taoists were attempting to create a potion for immortality. When gunpowder is ignited, it creates a chemical explosion. The charcoal and the sulfur act as fuels and the oxidizer is potassium nitrate. Gunpowder is used as a propellant in firearms. It is also used in fireworks.