Removing the cardboard casing and taping the igniter to the side of the propellant block gets you a four-foot ball of brilliant magenta flame that lasts 2-3 seconds and generates a pungent cloud of sulfurous smoke.
FABULOUS for disrupting a sophomore high school biology class.
Placement back among the lab tables away from student desks is crucial, and timing is essential to achieving the maximum number of observers at the maximum safe observing distance.
LOL.
When I lived in the Philippines back in the Sixties, some students blew up the school chemistry lab trying to make rocket fuel...:)