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gum bichromate process

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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.

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