dry plate

noun
1.
a glass photographic plate coated with a sensitive emulsion of silver bromide and silver iodide in gelatin.
2.
Metallurgy. tin plate having patches of dull finish.

Origin:
1855–60

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Britannica
Encyclopedia

dry plate

in photography, glass plate coated with a gelatin emulsion of silver bromide. It can be stored until exposure, and after exposure it can be brought back to a darkroom for development at leisure. These qualities were great advantages over the wet collodion process, in which the plate had to be prepared just before exposure and developed immediately after. The dry plate, which could be factory produced, was introduced in 1871 by R.L. Maddox. It was superseded by celluloid film early in the 20th century.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Formats included are: gelatin dry plate negatives and photographic prints.
Formats included are: photographic prints, gelatin dry plate negatives, negatives.
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