Pritchard, M. (2005). Darkroom, history and equipment. In The Oxford Companion to the Photograph. : Oxford University Press. Retrieved 1 Dec. 2023, from https://www-oxfordreference-com.libproxy.albany.edu/view/10.1093/acref/9780198662716.001.0001/acref-9780198662716-e-375.
Bussard, K. A., & Hostetler, L. (2013). Color rush : American color photography from Stieglitz to Sherman. Aperture.
in The Gelatin SIlver Process 10/12 the experts at the George Eastman Museum talk about the gelatin silver process and how this revolutionized the photography process. You don't have to bring a darkroom with you, you can develop out, rather than print out. Gelatin emulsion changed the whole way of shooting and printing photographs. and of making moving picture films.
Then in Color Photography they talk about how color photographs used to be made with different layers of different colored film, and how color analog photographs are made today with a gelatin silver emulsions.
George Eastman Museum. (2018). The Gelatin Silver Process - Photographic Processes Series - Chapter 10 of 12. YouTube. Retrieved November 20, 2023, from https://www.youtube.com/watch?v=r0eIH69QWd8&list=PLH_FfjHEuvR5U0Ur8rB35fezQ1yZkShMk&index=6.
George Eastman Museum. (2018a). Color Photography - Photographic Processes Series, Updated - Chapter 11 of 12. YouTube. Retrieved November 20, 2023, from https://www.youtube.com/watch?v=QP3uLdlAAAA.
There is another 59 second video from the George Eastman Museum about what exactly is Gelatin Silver Emulsion and how it is made.
George Eastman Museum. (2022, March 21). Darkroom magic: What is a gelatin emulsion?. YouTube. https://www.youtube.com/watch?v=cCth7PtBntg