I’ve thrown a match into a FULL 1 lb container of Hercules Red Dot. All I got was a rocket exhaust 10 feet high. Do that with black powder and you’re in for a world of hurt.
I had a can of black powder on my table and a friend convinced me to let him light some. I put one cap full in the ash tray. He lit it with his cigarette and it singed all the hair on his arm to his elbow before he could move his arm back.