Collotype

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Collotype \Col"lo*type\, n. [Gr. ? glue + -type.]
     A photomechanical print made directly from a hardened film of
     gelatin or other colloid; also, the process of making such
     prints. According to one method, the film is sensitized with
     potassium dichromate and exposed to light under a reversed
     negative. After the dichromate has been washed out, the film


     is soaked in glycerin and water. As this treatment causes
     swelling in those parts of the film which have been acted on
     by light, a plate results from which impressions can be taken
     with prepared ink. The albertype, phototype, and heliotype
     are collotypes.
     [Webster 1913 Suppl.]

From WordNet (r) 2.0 [wn]:

  collotype
       n : a photomechanical printing process that uses a glass plate
           with a gelatin surface that carries the image to be
           reproduced; can be used with one or more colors [syn: {collotype
           printing}, {photogelatin process}]