Collotype Variations
Though collotypes are often easily identified by their worm-like reticulation pattern, many variations on the process were patented. Collotypes printed through halftone screens, on non-paper supports or in combination with other processes may be difficult to properly identify.
A combination print collotype utilizing a halftone screen pattern (10x magnification).
Common variations include:
- Aquatone: Combination of collotype and halftone lithography
- Chromolithography and Collotype: Often a monochrome collotype printed over a chromolithographic image
- Gelatone: Collotype printed through a very fine halftone screen with a offset printing machine; used to print color reproductions of paintings and graphic arts
- Hoeschotype: Method of printing false color collotypes using five colored inks (yellow, red, blue, grey and black) in various combinations. This process was typically used for painting reproductions.
- Mezzograph: Trade name of a color process used by the Valentine Co. Ltd. for a series of postcards produced during the early 20th century. The process consisted of color fields printed with photolithography that were then overprinted with black and/or blue collotype images.