Exploding Fluid is found in the horn of the Erumpent. It causes anything that is impregnated with it to explode. It is highly valued as a potion ingredient, and is listed as a Class B Tradeable Material.
Behind the scenes
- In the handheld versions of LEGO Harry Potter: Years 1-4 Harry Potter had to get past a metal double-door in Knockturn Alley. He was given this Fluid to explode the door by a Mystic Wizard in exchange for two scarab beetles.