Drooble's Best Blowing Gum

Drooble's Best Blowing Gum is sold at Honeydukes in Hogsmeade and on the Hogwarts Express Food Trolley for two sickles. It is a brand of chewing gum that allows the consumer to blow bluebell-coloured bubbles which will not pop for days.

Behind the scenes
The Hasbro Company sells a cotton candy-flavored version of this candy that makes the inside of a person's mouth turn blue.

Ballongommes du Bullard