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What makes those rocks in the party poppers pop?

What makes those rocks in the party poppers pop?

rickharris2 years ago

black powder and a friction igniter - somewhat like a match in a fold of sand paper although the sand paper is on the string and the "match" is on the paper tube.

Or they may mean what used to be called "space rocks" or "space dust" when I was a kid, the candy that pops and bursts on your tongue.

Like this: https://www.instructables.com/id/Pop-Rocks/