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Poitevin discovered that a bichromated gelatin-covered plate could be used to produce prints after being exposed to light through a negative. First, a plate was rendered light-sensitive by coating it with warm potassium or ammonium bichromated gelatin and heating it at a steady temperature in an oven until dry.
The style and quality of the way the watercolor paint was applied changed over the years but their RGB pallet remained consistent.Postcard Publishers, Printers and Manufacturers This list contains information on the the printers and publishers that produced the postcards with Terre Haute as their subject.Acmegraph Company Based in Chicago, this company operated between 19.The hardening of the gelatin resulted in less absorption in the areas which received the most light (those which will appear the darkest in the print).The plate was soaked in cold water, dried, and before printing it was wet again with a glycerine and water solution.Collotypes were important to the industry of photographic reproductions because they were fairly cheap to produce, and their range of tones permitted exact reproductions of photographs through a photomechanical process.
They are also noted for their ability to accurately reproduce drawings, prints, and watercolors, and are still in limited use to this day.
During its nearly sixty year run, the Albertype Company produced over twenty-five thousand prints, which were distributed across the United States in the form of postcards and viewbooks.
The company had agents, including Adolph Wittemann, take photographs of different cities and regions, which were then reproduced as collotypes.
In the late nineteenth century, photographic and photomechanical reproduction were becoming increasingly popular for commercial use.
The collotype, one of the most commercially successful photomechanical processes, was introduced in 1855 by the French photographer and chemical engineer Alphonse-Louis Poitevin.
Many publishers large and small printed cards though the Albertype Co.