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collotype

 - 3 dictionary results

col⋅lo⋅type

  [kol-uh-tahyp] noun, verb, -typed, -typ⋅ing.
Use collotype in a Sentence
–noun Also called albertype, artotype, heliotype.
1. any photomechanical process of printing from a plate coated with gelatin.
2. the plate used for this.
3. a print made from such a plate.
–verb (used with object)
4. to produce (a print) by collotype; albertype; artotype; heliotype.
Origin:
1880–85; < Gk kóll(a) glue + -o- + -type

Related forms:
col⋅lo⋅typ⋅ic  [kol-uh-tip-ik] , adjective
col⋅lo⋅typ⋅y  [kol-uh-tahy-pee] , noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To collotype
col·lo·type   (kŏl'ə-tīp')   
n.  

  1. A printing process employing a glass plate with a gelatin surface that carries the image to be reproduced. Also called photogelatin process.

  2. A print made by this process.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia

collotype

photomechanical printing process that gives accurate reproduction because no halftone screen is employed to break the images into dots. In the process, a plate (aluminum, glass, cellophane, etc.) is coated with a light-sensitive gelatin solution and exposed to light through a photographic negative. The gelatin is hardened in exposed areas and is then soaked in glycerin, which is absorbed most in the non-hardened areas. When exposed to high humidity, these areas absorb moisture and repel the greasy ink. The hardened areas accept the ink, and the plate can be used to print a few thousand copies of the positive image

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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