[sb8244]

I made this for my high school chemistry project. We made it in the morning so it would be ready for our afternoon class.

It was drying in the chemistry back office and there must have been a draft. It exploded during a silent study hall.

Somehow they let us remake it for class that afternoon. We tried to put it on the floor as a joke, but our teacher was wearing sandals that day (no lab). She wasn't happy about it.

I originally got the idea (and prank idea) the previous year from a retiring chemistry teacher.

[keepamovin]

lol - great story. So many good stories here about this stuff.

I agree with others who say it's dangerous, but only if you use sufficient quantities, or contained (don't contain!). A few crystals sprinkled in different places will just produce the pops and not hurt anything - I think! :)

From memory: size of a full stop or white sesame seed will already produce a very (but not painfully) loud bang; whereas a speck so tiny on the ground you can't readily see it from standing height is sufficient for a "walking over" prank, surprisingly loud for how tiny it is.

The ultrafast snappy pop and purple smoke is satisfying, but it does stain.

I like the comment about ping pong - hilarious use case.