Reparifarge

"Incomplete Transfigurations are difficult to put right, but you must attempt to do so. Leaving the head of a rabbit on a footstool is irresponsible and dangerous. Say 'Reparifarge!' and the object or creature should return to its natural state."

- A Beginner's Guide to Transfiguration

Reparifarge is the incantation of a counter-spell. It appears to be a general spell used to counter the effects of a Transformation spell that was poorly performed and only partially transfigured the object in question. This spell is covered in A Beginner's Guide to Transfiguration, which stresses the importance of at least attempting this spell when necessary, as the products of incomplete Transfigurations can be dangerous.

Appearances

 * Pottermore