Concussion "Boom" Powder

This stuff is loud. It took me a little more than the 1/4 teaspoon to achieve my desired effect...but that's because we had a large auditorium to fill with sound...In a smaller setting that I've used it in in the past, this powder is loud AND gives a nice upward spark out of the heavy duty flash pots. Makes for a great effect in the Wizard of Oz when they are talking to the Wizard!! Highly recommended