MattAttackPro is a chemistry and physics teacher in South Carolina. This is what happened when he dropped a roll of unused camera film into a container of hydrochloric acid.
What you're seeing is the plastic backing separating from the "film" from which film takes its name—a coating of multiple layers of light-sensitive salts suspended in gelatin. Yes, film is like a jello salad. And it makes for a beautiful photograph.
Maggie Koerth-Baker is the science editor at BoingBoing.net. She writes a monthly column for The New York Times Magazine and is the author of Before the Lights Go Out, a book about electricity, infrastructure, and the future of energy. You can find Maggie on Twitter and Facebook.