The standard demonstration of dust explosions used to use lycopodium powder (which were actually the spores of the club moss fern..) in a biscuit tin*. In the tin you had a candle and a small funnel attached to a length of rubber tubing which led out of the tin. A tablespoon of Lycopodium was put in the funnel, the candle was lit and the lid replaced..
You then blew down the tubing causing a loud flash and bang, and blowing the lid off the tin.. IKYN this was the standard school demo back in the day...!
* not the modern flat biscuit tin you see these days. We are talking here about the old commercial biscuit tins which were about 30x30x40cm made out of quite thick tinplate..
Edited to add... some more interesting stuff about Lycopodium! Its main use seems to be to demonstrate dust explosions, although it is/was used to dust rubber gloves and condoms...
Who Knew! - be careful out there!
When I started working in the Middle East the only safety training I got was (a) watching a film of a custard powder explosion and (b) being told "watch out for the detonators. Handle them carefully and don't go near them if the windspeed gets above 20mph".
That was it. The HSE lay a long way in the future.
I added a third for my successor: (c) don't touch the dynamite without gloves or you will get a blinding headache".