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printout paper

noun Photography.
  1. sensitized paper for prints that darkens under light and requires treatment to fix an image: largely supplanted at the turn of the century by developing-out paper. Abbreviation: P.O.P.
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Origin of printout paper

First recorded in 1890–95
Also called printing-out paper.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018