Ectoplasm

"... 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 cleaned with Skurge, which is learnt in second year Charms. The Stickfast Hex is known to produce a sticky imitation of this substance.

Behind the scenes

 * The Toad, a ghost appearing in the earliest drafts for Harry Potter and the Philosopher's Stone, left ectoplasm all over its classroom.
 * The early stages of the making of video game adaptation of Harry Potter and the Chamber of Secrets, included plans for an ectoplasm-creating spell.

Appearances

 * Harry Potter and the Chamber of Secrets (video game)
 * Harry Potter and the Prisoner of Azkaban (video game)
 * Harry Potter Trading Card Game
 * Pottermore

Notes and references
Ektoplazma