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"Second-year Hogwarts students brew Swelling Solution in Potions class. This potion causes things to grow and expand. Its effects can be reversed with a Deflating Draught."
—Description[src]

The Swelling Solution is a potion which causes whatever it touches to swell in size; its three key ingredients (the only ingredients in it) are bat spleens, dried nettles, and puffer-fish eyes.

History

The trio decided to steal some ingredients for the Polyjuice potion from their potions teacher's private stores in their second year the day the class tried to make this potion. Harry Potter set off one of his fireworks as a diversion for Hermione Granger to get the necessary ingredients; whether intentionally or accidentally, the firework landed in Gregory Goyle's cauldron, causing the solution to explode across the class, most notably affecting Draco Malfoy, who got it in the face and endured his nose swelling to the size of a melon, and Goyle himself, whose eyes expanded to the size of dinner plates; other afflictions included arms like clubs and gigantic puffed-up lips which rendered speech impossible. Those splashed had to go to the professor for a Deflating Draught.[1]

Brewing instructions

Part 1

  1. Add 2 scoops of dried nettles to the mortar
  2. Add 3 puffer-fish eyes to the mortar
  3. Crush into a medium-fine powder
  4. Add 2 measures of the crushed mix to your cauldron
  5. Add two tablespoons of water to the powder in the cauldron and mix them together
  6. Heat on a medium temperature for twenty minutes
  7. Add some more water to the cauldron and stir the mixture carefully
  8. Wave your wand
  9. Leave to brew and return in 60 minutes (depends on the type of cauldron used)

Part 2

  1. Add 1 bat spleen to the cauldron
  2. Stir 4 times, anti-clockwise
  3. Heat to low for 30 seconds
  4. Wave your wand to complete the potion[2]

Behind the scenes

  • Given that every potion's brewing process can only be completed by casting a spell, and that it can vary for each potion, the most likely spell used to complete this potion is the Engorgement Charm.

Appearances

Notes and references


Potions (class)
Wideye-or-awakening-potion
Potioneers
Arsenius Jigger · Bilius Finbok · Damocles Belby · Erica Stainwright · Fleamont Potter · Gethsemane Prickle · Gilderoy Lockhart · Glover Hipworth · Golpalott · Gregory the Smarmy · Gunhilda de Gorsemoor · Hector Dagworth-Granger · Hesper Starkey · J. Pippin · Laverne de Montmorency · Libatius Borage · Linfred of Stinchcombe · Mulpepper · Nicolas Flamel · Phineas Bourne · Quintia McQuoid · Regulus Moonshine · Rubens Winikus · Sacharissa Tugwood · Skower · Tilden Toots · Dr. Ubbly · Vindictus Viridian · Zygmunt Budge
Potions at Hogwarts
Cauldron cupboard · Dungeon Five · Potions basement · Potions Classroom · Potions Club · Potions Staircase · Potion Master's office · Potion Master's storeroom
Professors Bartholomew · Horace Slughorn · Severus Snape · Swoopstikes · Unnamed Professor (16th century) · Unnamed Professor (2021)
Textbooks Magical Drafts and Potions · One Thousand Magical Herbs and Fungi · Advanced Potion-Making · Moste Potente Potions · A Collection of Above Three Hundred Receipts in Cookery, Physick, and Surgery
Potions studied at Hogwarts
Ageing Potion · Amortentia · Antidotes · Antidote to Common Poisons · Antidote to garish pink blended poison · Antidote to Uncommon Poisons · Befuddlement Draught · Calming Draught · Confusing Concoction · Boil-Cure Potion · Deflating Draught · Doxycide · Draught of Living Death · Draught of Peace · Elixir to Induce Euphoria · Everlasting Elixirs · Felix Felicis · Fire Protection Potion · Forgetfulness Potion · Garish pink blended poison · Girding Potion · Hair-Raising Potion · Herbicide Potion · Hiccoughing Solution · Invigoration Draught · Pepperup Potion · Polyjuice Potion · Pompion Potion · Shrinking Solution · Skele-Gro · Sleeping Draught · Strengthening Solution · Swelling Solution · Undetectable Poisons · Weedosoros · Wideye Potion · Wiggenweld Potion · Wit-Sharpening Potion · Wound-Cleaning Potion
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