Gum bichromate
One of the most versatile Alternative Processes, Gum Bichromate was invented in 1855, and became popular at the turn of the century.
Gum Bichromate
Techniques Glossary Gum Bichromate
One of the most versatile Alternative Processes, Gum Bichromate was invented in 1855, and became popular at the turn of the century.
bichromate
a photosensitive salt of ammonium or potassium bichromate used as a sensitizer in some screen printing stencil emulsions.
-Bichromate - refers to potassium bichromate or potassium dichromate, used for bleaching and as a sensitizer for gelatin.
Gum Bichromate
Often called "gum." An early process in which exquisite colored prints are made by printing on paper coated with layer(s) of sensitized and pigmented gum arabic.
-Sodium bichromate - chemical used in intensifiers, toners and bleaches.
-Sodium bisulfite - chemical used in fixing baths as an acidifying agent.
-Sodium chloride - used in some bleaches and reducers.
The commonly used photographic light-sensitive materials are the silver halides used in films and papers, diazo dyes, and bichromated gelatin.
As a portraitist and free- lance photographer in San Francisco, New York, and London, he was always experimenting - using multiple- exposure, solarization, cliché- verre, relief printing, the gum- bichromate and autochrome processes, ...
The gelatin had previously been made light-sensitive by a bath of potassium bichromate. After washing, the image on the tissue was transferred to a paper base and the backing of the tissue was stripped off.
 See also: Light, Image, Print, Exposure, Prints
  
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