ABSTRACT
From the late nineteenth century, factories manufactured gelatin-silver emulsions that were coated onto papers of various pale colors and thicknesses, glass (also known as lantern slides and dry plates), silk fabric, and even flock paper. Emulsions were first made with gelatin-silver bromide in the 1880s and have been used ever since because the mixture was sensitive enough for an image to be projected, rather than contact-printed, onto it and developed. A more thorough history of silver emulsion starts on page 253.
