TO, one of our Rotarians is an explosives engineer. In his job talk he brought some black powder. He lit it and it fizzled.
Then he got a second batch. I can't remember the ignition process or the tamper but it blew a foil dish 6 feet. Impressive in the dining room.
Earlier, at Waddo we had an IED demo, litre of petrol, thunderflash and tin hat. That made 50 feet and blew the rim off.