All Photographic and Film Chemistry

Light sensitive coatings and dye processes behind photography and the early cinema, in which a base is coated with an emulsion of silver compounds that records an image, and later treated chemically to add color. An invention belongs here when the cited article describes photographic film, or a chemical process for coloring or developing film. It excludes cameras, projectors and other optical machines, which belong with the devices that capture or show images.