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"Merlin's beard! No need to disfigure me, Albus."
Horace Slughorn to Albus Dumbledore[src]

Untransfiguration was a branch of transfiguration magic and a type of counter-spell, which involved returning something to its proper form, reversing the effects of a transfiguration.

Untransfiguration was covered in beginner-level spellbooks such as A Beginner's Guide to Transfiguration. Learning untransfiguration was mandatory at Hogwarts School of Witchcraft and Wizardry from 1926 onward.[1] Failure to at least attempt to untransfigure a wrongly-done transfiguration was considered irresponsible.

Methods

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Professor McGonagall untransfiguring Draco Malfoy in 1994

Reparifarge seems to be a general Untransfigurative spell used to counter the effects of a Transformation spell that was poorly performed and only partially transfigured the object in question.[2] The spell is located in A Beginner's Guide to Transfiguration by Emeric Switch.

Vipera Evanesca is also a Untransfiguration spell. The incantation for the spell that causes a target Snake to vanish in a puff of black smoke. As such, it can be used as a counter-spell for spells that produce serpents, such as Serpensortia or the Fire to snake spell, annihilating the conjured or transfigured snake. 

Revelio could be used to untransfigure a human transfiguration.

Known instances of Untransfiguraton

In Harry Potter's first Transfiguration class, in 1991, when Professor Minerva McGonagall Transfigured her desk into a pig, and the pig back to a desk.

Also in 1993 when Remus Lupin and Sirius Black changed Peter Pettigrew from a rat back into his usual human appearance.

In 1994 when the new Defence Against the Dark Arts professor Barty Crouch Jr (disguised as Alastor Moody) transfigured Draco Malfoy into a ferret Minerva McGonagall transfigured him back.

Known practitioners

Behind the scenes

According to W.O.M.B.A.T., it may not be possible to Untransfigure a person or object without knowing what they were originally. However, in Harry Potter and the Goblet of Fire, when Draco Malfoy is turned into a ferret, Professor McGonagall Untransfigures him while only knowing that it was a student, not who it was specifically. This implies that either one does not need to know very specific details about what the object was before Transfiguration or that she guessed it was Malfoy due to his absence from his usual gang.

Appearances

Notes and references


Transfiguration (class)
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Branches of Transfiguration
Transformation · Vanishment · Conjuration · Untransfiguration
Known practitioners
Emeric Switch · Circe · Falco Aesalon · Mirabella Plunkett · Thaddeus Thurkell
Professors
Albus Dumbledore · Minerva McGonagall
Textbooks
A Beginner's Guide to Transfiguration · Intermediate Transfiguration · A Guide to Advanced Transfiguration
Transfiguration spells studied at Hogwarts
Change of hair colour and style (Crinus Muto) · Hardening Charm (Duro) · Mending Charm (Reparo) · Reparifarge · Softening Charm (Spongify) · Switching Spell · Vanishing Spell
Transforming Spells
Animal to Water Goblet (Vera Verto) · Beetle Buttons · Cat to Cauldron (Felifors) · Chair to cat · Guinea fowl to guinea pig · Hedgehog to pincushion · Match to needle · Meddling Man to Monkey · Mice to Snuffboxes · Owl to Opera Glasses (Strigiforma) · Porcupine to Pin Cushion (Hystrifors) · Small Child to Rat · Small Object to Dragon (Draconifors) · Snail to Teapot · Target to Bird (Avifors) · Target to Rabit (Lapifors) · Teacup to Rat · Teapot to tortoise · White Rabbits to Slippers