- "... an unpleasant greenish substance left behind by certain ghostly beings ..."
- —Filius Flitwick
Ectoplasm is a green substance left behind from some ghosts. This substance can be clean with a simple Ectoplasm-Cleaning Charm, learned in Second year Charms. The Stickfast Hex is known to produce a sticky imitation of this substance.
Behind the scenes
- Harry Potter and the Chamber of Secrets (video game) (First appearance)
- Harry Potter and the Prisoner of Azkaban (video game)
- Harry Potter Trading Card Game
- Pottermore (Mentioned only)