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"And a boy in my dormitory said if I develop the film in the right potion, the pictures'll move."
— Colin Creevey regarding the potion[src]

The developing solution[3] was a potion, that, when used in the developing of photographs, allowed the pictures to move.[1][2] It will apparently even work with Muggle film, as the Muggle-born wizard Colin Creevey learned during his first year, much to his delight.[1]

Appearances

Notes and references

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