the safest way to make black powder is to wet the ingredients{stale urine is best} <br>after its blended let it dry then break it up to the grain size you need.
Urine? You only need that it you're extracting your own salt petre. <br> <br>Grind all the ingredients to size *separateley*, then mix by tumbling.
Do NOT grind the mixed ingredients in a pestle and mortar - I know of at least two people who have lost several fingers doing that. <br> <br>As for grinding them in a coffee grinder, you are just BEGGING for a serious, potentially-fatal accident. <br> <br>If you want to make black powder, folks, find a different tutorial to follow.
Yes, Kiteman. When I was a teenager, I was filling a firework rocket and suddenly it lit by friction under my hand. I was lucky that there was only a bit of powder and not suffered serious hurt, only a superficial burn.