A friend had some off the shelf FF black powder. If you roll that inside aluminum foil and toss it into a fire, it functions nicely as a firecracker.
I put the ad hoc musing away as I headed off to college. Plenty of lab work focused on meeting classroom requirements.
Speaking of S&B, I have a couple boxes of their 9mm on the table. It's good quality ammo.
I did gunpowder too, besides making lots, including experiments in corning it. By far the most dangerous things I did in this line!
Nitroglycerin is ... ambitious!
I taped a cigarette to large hydrogen balloons for a time fuse.
I feel lucky to be around today. ;)