My gunpowder does not work?

Hello, I wanted to craft small salute shells with my DIY gunpowder. I used 7,5 spoons KNO3, 1,5 spoons sulfur and 1 spoon charcoal. Then I put the whole mixture into my Lego ballmill with marbles. After 10 - 12 hours I took the mixture out and ignited 1 gramm. It just sparkled, I had to light it more times because it didnt fully burn. Anyone know what I did wrong? The engine of the lego ballmill is really strong and it is turning fast. Sorry for my bad english Thank you very much Kind regards Sami

Question by Nanafalke   |  last reply