Space Dust / Popping Candy
Sherbet that exploded in your mouth and possibly your stomach, according to playground lore.
Carbonated sugar crystals that crackled and fizzed, accompanied by an urban legend about a child who drank cola afterwards.
Every school had a version of the same story, always about a child at another school, who had combined popping candy with fizzy drink and come to a bad end.
It was completely untrue and universally believed, which makes it a perfect piece of playground folklore.
Cost back then
10p
Goes for now
About 60p