Then today is your lucky day - a South Carolina physics teacher has done just that, as shown in the image above.
A standard photographic film consists of a plastic layer with halide salts attached using gelatin which, when exposed to a light source, forms an invisible image. Chemicals are then applied to this invisible image to “develop” the film.
As you can see in the image above, the hydrochloric acid has caused the plastic layer to completely separate from the gelatin-containing salts producing two distinct states.
(via Boing Boing)