Collotype

DEFINITION

A process developed for inexpensive and large volume mechanical printing before the widespread use of still cheaper offset litho, it has results very similar to photography. However, the process is no longer used commercially. It involves a collotype plate made by coating a sheet glass that is pre-coated with a layer of gelatin that has been carefully dried and broken into a finely-grained pattern. The plate is then exposed in contact with the negative by using a UV light source. To make prints, the plate is dampened with a slightly acid glycerine/water mixture, then wiped and blotted before inking with lithographic ink using a roller. Paper is then put on top of the plate and covered before being printed using relatively light pressure, either in a lithographic press or by hand using a firm roller. Sources: http://www.hyperdictionary.comhttp://photography.about.com/library/glossary/bldef_collotype.htm <br><br>A photographic printing process in which a glass plate whose surface has been coated with gelatin carries the image to be reproduced. Also called a photogelatin process.Examples:Eadweard Muybridge (American, born in England, 1830-1904), Jumping a hurdle; saddle; bay horse Daisy Plate 640 of Animal Locomotion, 1887, collotype, Worcester Art Museum, MA. See animation, cinema, equine art, movement, and time. Max Ernst (German, 1891-1976), The Hat Makes the Man, 1920, gouache, pencil, ink, and collaged collotypes, 14 x 18 inches (35.6 x 45.7 cm), Museum of Modern Art, NY. See Dada.Related link: "The Illustrated Book Study" is a collaborative effort undertaken by Cornell University Library&#39;s Department of Preservation and Conservation and Picture Elements, Inc, and the Library of Congress. On its Illustrated Book Study Resolution Samples pages, visitors can examine digital images of prints of several types ? collotype, copper engraving, etching, halftone, lithograph, mezzotint, photogravure, steel engraving, and wood engraving ? at each of several resolutions ? dots per inch (DPI). Also see negative.

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