The gelatin silver process is the most commonly used chemical process in black-and-white photography,
and is the fundamental chemical process for modern analog color
photography. As such, films and printing papers available for analog
photography rarely rely on any other chemical process to record an
image. A suspension of silver salts in gelatin is coated onto a support such as glass, flexible plastic or film, baryta paper, or resin-coated
paper. These light-sensitive materials are stable under normal keeping
conditions and are able to be exposed and processed even many years
after their manufacture. The "dry plate" gelatin process was an improvement on the collodion wet-plate process dominant from the 1850s–1880s, which had to be exposed and developed immediately after coating.
https://en.wikipedia.org/wiki/Gelatin_silver_process
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