Re: 4th of July Rocks
I think that originally, there were two minerals in gunpowder. They are Niter and Sulfur. Today, I believe most of the potassium nitrate (niter) is synthesized and most of the sulfur is a byproduct of refining ores.
The stuff on the sparklers that make them sparkle is iron filings.
Have a great . . . and safe 4th!
From Don Peck - July 04, 2007 at 10:44:23