Swelling Solution

The Swelling Solution is a potion which causes whatever it touches to swell up in size. One of its known ingredients is puffer-fish eyes.

The trio decided to steal from Severus Snape's store cupboard in their second year for ingredients for the Polyjuice Potion, when they were making the Swelling Solution. Harry set off one of the Dr. Filibuster's Fabulous Wet-Start, No-Heat Fireworks as a diversion so that Hermione could get the ingredients; unfortunately the firework landed in Gregory Goyle's cauldron causing an explosion of solution that caused the limbs of nearby students to swell. They had to go to Professor Snape for the Deflating Draught.

Appearances

 * Harry Potter and the Chamber of Secrets