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gum bichromate process

noun
  1. a contact printing method in which the image is formed on a coating of sensitized gum containing a suitable colored pigment and potassium or ammonium dichromate.
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Origin of gum bichromate process

First recorded in 1895–1900
Also called gum dichromate process.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018