A friend of mine made a pound of his homemade firework putty this year, a capful will make an explosion about the size of that one of yours. He uses aluminum oxide and some other ingredients, the blasts are rapid and breathtaking. I know enough to be dangerous too and used to make some magnesium and aluminum oxide vessels with smokeless powder and a coiled magnesium fuse a foot long but stopped when I went down in a bar ditch and set the biggest one yet off. When it went off we could not breathe for a couple of frightening minutes and we were 30ft away, it blew a 4' pothole in the road about 2' deep and then once we got to our feet it rained down all the stuff that once occupied the hole. Scared the shit out of me, that entire roll of duct tape binding it caused it to be many times more intense but that's why I did it. So I'm out of the demolition business, the stuff we did back then would get me thrown in jail for some time these days. Be careful out there, looks like a long trip to the ER.