Linked from
The 10 pages that link to Photographic paper, each with the reason it gives.
John HerschelRelated: Herschel experimented with sensitized paper as a surface for recording images.
Latent imageRelated: Light from a negative forms a latent image directly in its emulsion.
CalotypeRelated: The process made paper both the negative support and a surface for positive prints.
DarkroomRelated: Its emulsion type determines exposure, contrast, and safelight compatibility.
Silver bromideRelated: Silver bromide emulsions have been used to make papers for darkroom printing.