In the early 70's I bought a Lyman .36 cal Navy cap and ball revolver that I shot for about 8-10 years before regretfully selling it in a time of need (got married, had kids, you know the story). I kept an unopened 1lb can of DuPont FFG for years, until I got a great idea to dispose of it one 4th of July after dark. At the time, I was processing my own black & white film and prints, and had a few empty bulk 35 mm film cans laying around. I filled one with all but about a 1/4 cup of that lb of FFG, duct taped it every way but Sunday and poked a small flash hole in the top of the lid. I took it out behind the house in a courtyard that was surrounded on 3 sides by other houses, poured the remaining powder in a thin line (about 6 ft.) up to the flash hole, and touched it off. I think, even before the match touched the powder, the can ignited, instantly burning all of the hair off the right side of my body. Shorts and t-shirt right? After all, it was the 4th of July. I remember that the entire courtyard lit up like daylight, and I didn't stop running until I reached the shower in the basement. The next afternoon, I was in the back yard talking to the next door neighbor about the regular stuff, and he asked me if I heard that humongous blast last night. I shouted WHAT! The hearing slowly returned to my right ear.