Collotype
Encyclopedia
Collotype is a dichromate-based photographic process invented by Alphonse Poitevin
in 1856. and was used for large volume mechanical printing before the existence of cheaper offset lithography. It can produce results difficult to distinguish from metal-based photographic prints because of its microscopically fine reticulations which comprise the image. Many old postcards are collotypes. While no longer a commercial process, its possibilities for fine art photography were first employed in the United States by Alfred Stieglitz
.
The collotype plate is made by coating a plate of glass or metal with a substrate composed of gelatin or other colloid and hardening it. Then it is coated with a thick coat of dichromated gelatine and dried carefully at a controlled temperature (a little over 50 degrees Celsius) so it 'reticulates' or breaks up into a finely grained pattern when washed later in approximately 16 °C water. The plate is then exposed in contact with the negative using an ultraviolet
(UV) light source which changes the ability of the exposed gelatine to absorb water later. The plate is developed by carefully washing out the dichromate salt and dried without heat. The plate is left in a cool dry place to cure for 24 hours before using it to print.
To produce prints, the plate is dampened with a glycerine/water mixture which is slightly acidic , then blotted before inking with collotype ink using a leather or velvet roller. A hard finished paper such as Bristol, is then put on top of the plate and covered with a tympan
before being printed typically using a hand proof press. Collotypes are printed using less pressure than is used in printing intaglio, or stone lithography. While it is possible to print by hand using a roller or brayer, an acceptable consistency of pressure and even distribution of ink is most effectively achieved using a press.
Because of its ability to print fine detail, it was also used for business cards and invitations with fine script lettering.
Alphonse Poitevin
Alphonse Poitevin was a French chemist, photographer and civil engineer who discovered the light–sensitive properties of bichromated gelatin and invented both the photolithography and collotype processes....
in 1856. and was used for large volume mechanical printing before the existence of cheaper offset lithography. It can produce results difficult to distinguish from metal-based photographic prints because of its microscopically fine reticulations which comprise the image. Many old postcards are collotypes. While no longer a commercial process, its possibilities for fine art photography were first employed in the United States by Alfred Stieglitz
Alfred Stieglitz
Alfred Stieglitz was an American photographer and modern art promoter who was instrumental over his fifty-year career in making photography an accepted art form...
.
The collotype plate is made by coating a plate of glass or metal with a substrate composed of gelatin or other colloid and hardening it. Then it is coated with a thick coat of dichromated gelatine and dried carefully at a controlled temperature (a little over 50 degrees Celsius) so it 'reticulates' or breaks up into a finely grained pattern when washed later in approximately 16 °C water. The plate is then exposed in contact with the negative using an ultraviolet
Ultraviolet
Ultraviolet light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than X-rays, in the range 10 nm to 400 nm, and energies from 3 eV to 124 eV...
(UV) light source which changes the ability of the exposed gelatine to absorb water later. The plate is developed by carefully washing out the dichromate salt and dried without heat. The plate is left in a cool dry place to cure for 24 hours before using it to print.
To produce prints, the plate is dampened with a glycerine/water mixture which is slightly acidic , then blotted before inking with collotype ink using a leather or velvet roller. A hard finished paper such as Bristol, is then put on top of the plate and covered with a tympan
Tympan
In hand-operated letterpress printing, the bruzer tympan is the taut cloth or paper mounted in a frame which is placed over the sheet of paper immediately prior to lowering the platen to make the impression....
before being printed typically using a hand proof press. Collotypes are printed using less pressure than is used in printing intaglio, or stone lithography. While it is possible to print by hand using a roller or brayer, an acceptable consistency of pressure and even distribution of ink is most effectively achieved using a press.
Because of its ability to print fine detail, it was also used for business cards and invitations with fine script lettering.