So, I made a batch of black powder in a commercial context. It was eventually used in a Swedish national television show, featuring yours truly as the guest host talking about alchemy and related matters. Details to be disclosed at a later stage.
Anyway, there were some leftovers, and my 7-year-old son and his cousin really wanted to see the powder in action. Here you go. English subtitles and all.
Don’t try this at home! Wait. I just did :/