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- In 1842, Herschel invented the cyanotype. The cyanotype process uses light-sensitive iron salts produced by brushing solutions of ferric ammonium citrate and potassium ferricyanide, also known as Prussian blue, onto paper, which is then dried in the dark.
sites.utexas.edu › ransomcentermagazine › 2010/12/07From blue skies to blue print: Astronomer John Herschel’s ...
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Dec 7, 2010 · In 1842, Herschel invented the cyanotype. The cyanotype process uses light-sensitive iron salts produced by brushing solutions of ferric ammonium citrate and potassium ferricyanide, also known as Prussian blue, onto paper, which is then dried in the dark.
- Courtney Reed
Feb 28, 2023 · Sir John Herschel: The inventor of cyanotypes. Sir John Herschel began by experimenting with sun prints (or photograms). These were one of the earliest forms of photography and involved laying an object on chemically-treated paper before exposing it to a light source.
- The Process
- Working with The Cyanotype Process
- Useful Resources
Solution A: 6.5 grams ferric ammonium citrate (green) in distilled water to make 25ml total Solution B: 2.3 grams potassium ferricyanide in distilled water to make 25ml total Note: Today, distilled water is known as ‘purified water’. Store separately in brown glass bottles, away from light. Filter before use, and mix in equal proportions A to B.
Setting up
Working area 1.Lighting for working: avoid daylight and fluorescent lighting, use low level tungsten light and limit total exposure. Working surfaces: clean, and covered: newspapers, paper towels
Sensitising
Mixing chemical solutions 2.Measuring: clean dry paper for weighing dry chemicals, clean containers for measuring liquids 3.Labelling: identify, give proportions, date Coating chemical solutions 4.Tape down paper 5.Brushes: Buckle’s brush for smooth dense paper, soft hair brush for rough, porous paper or cloth; Glass rod: for smooth, even coatings; Roller: foam for cloth 6&7.Coating with a brush—use horizontal and vertical brush strokes 8&9.Coating with a glass rod: use syringe to distribute...
Drying
10.Drying: line and clothes pegs, boards or Perspex. Floor surface: protect with newspapers
Louis Philippe Clerc, Photography: Theory and Practice, edited by Andor Kraszna-Krausz (London: Focal Press, 1954)William Crawford,The Keepers of Light: A History and Working Guide to Early Photographic Processes(New York: Morgan & Morgan, 1979)Nancy Howell-Koehler, Photo-Art Processes(Worcester, Massachusetts: Davis Publishers, 1980)Sir John Frederick William Herschel, 1st Baronet KH FRS (/ ˈ h ɜːr ʃ əl, ˈ h ɛər-/; 7 March 1792 – 11 May 1871) was an English polymath active as a mathematician, astronomer, chemist, inventor, and experimental photographer who invented the blueprint and did botanical work.
- The invention of photography
- Eton College
Feb 7, 2021 · The cyanotype process, also known as the blueprint process, was first introduced by John Herschel (1792 – 1871) in 1842. Sir John was an astronomer, trying to find a way of copying his notes. Herschel managed to fix pictures using hyposulphite of soda as early as 1839.
Sep 1, 2009 · The light turned the chemical blue, leading Herschel to believe he had found a basis for the invention of color photography. He had not—nor would he live long enough to witness the true...
Sep 11, 2020 · One method that was introduced in the 19th century is cyanotype photography —an early photographic process known for the brilliant blue (cyan) hue of the final print. It was developed in 1842 by English astronomer Sir John Herschel, who was looking for a way to make copies of his notes.
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