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wet plate process

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noun
  1. a photographic process, in common use in the mid-19th century, employing a glass photographic plate coated with iodized collodion and dipped in a silver nitrate solution immediately before use.
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Also called wet collodion process, collodion process.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018