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Meaning of gum bichromate process

gum' bichro'mate proc"ess

Pronunciation: [key]
  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. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.