Translations:Adventist Youth Honors Answer Book/Arts and Crafts/Photography/68/en
From Pathfinder Wiki
Photographic film is a sheet of plastic (polyester, nitrocellulose or cellulose acetate) which is coated with an emulsion containing light-sensitive silver halide salts (bonded by gelatin) with different crystal sizes that determine the sensitivity and resolution of the film. When this emulsion is subjected to sufficient exposure to light, it forms a latent (invisible) image. Chemical processes are then applied to the film to create a visible image, in a process called film developing.
