Developing Potion

• Type: Potion
• Users: Colin Creevey
• Maker: Unknown

The physical appearance of the developing potion, such as its color or consistency, is not described in the novels. It is a magical liquid solution used in a tray, similar to a Muggle developing chemical, for the purpose of processing Wizarding photographs.

The primary magical property of the developing potion is to bring Wizarding photographs to life, causing the subjects within the pictures to move. This process is the magical equivalent of Muggle photographic development, but with the crucial enchantment that animates the final image. To use the potion, an exposed piece of photographic paper is submerged in a tray containing the solution. As the image materializes on the paper, it becomes animated, allowing the figures within to move, wave, or otherwise reenact a short, looped moment from when the picture was taken.

The developing potion is featured exclusively in Harry Potter and the Chamber of Secrets. Harry Potter first encounters it when he finds Colin Creevey in a makeshift Darkroom. Colin is agitated because he has run out of the potion and is therefore unable to develop the photograph he took of Harry with Gilderoy Lockhart. He enthusiastically explains to Harry that it's the potion that makes the pictures move. This substance, while only mentioned once, is fundamental to a key piece of evidence later in the book. After Colin is Petrified by the Basilisk, his camera is recovered. The existence of a magical development process, as established by Colin's explanation of the potion, confirms that his photographs are magical in nature. The picture from his camera helps Professor Dumbledore and Professor McGonagall deduce that Colin saw the Basilisk indirectly through his camera's viewfinder, which is what saved him from a direct, fatal gaze. The potion is the necessary component for revealing such magical photographic evidence.

• The developing potion is a prime example of how the Wizarding world adapts Muggle technology for its own purposes. While the camera itself is a Muggle invention, wizards have imbued the chemical development process with magic to create their signature animated portraits and photographs.
• In the film adaptation of Harry Potter and the Chamber of Secrets, the scene in the darkroom and the specific mention of the developing potion are omitted. The discovery of Colin's melted camera still occurs, but the magical mechanics of the photograph are not discussed. (film)