OUR MOST POPULAR VIDEO! Blast Waves and Flash Powders. Flash powder manufacturing is still the most dangerous of fireworks operations. And still fraught with myths and misunderstandings. What is the best formulation for salutes Indeed, how does the producer decide between depth and sharpness of the sound Which formulations produce the sharpest sound, the loudest boom Join Ken Kosanke at the 94 PGI convention in New Castle and explore the physics and chemistry of this remarkable phenomenon. 55 minutes.