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If paper was treated with these to make it light-sensitive, and then placed over the camera image, the parts receiving light from the bright part of the image darkened, and those corresponding to the dark parts of the image remained light, producing a negative image.
Paper is coated with a mixture of potassium ferrocyanide and ferric ammonium citrate and then dried. A photographic negative or an object is placed on the paper and exposed to light. The paper is then washed in water to leave a chemical mixture called ferric ferrocyanide or Prussian blue.
But the process simultaneously developed in England for capturing an image on a paper negative—from which many positives could be printed—provided the foundation on which photography would build for the next 150 years.
- Roger Taylor, Larry J. Schaaf
- Taylor, Roger and Schaaf, Larry
- 2007
- RAE2008 UoA63
Feb 28, 2023 · Cyanotype photography is a camera-less technique that involves laying an object on paper coated with a solution of iron salts before exposing it to UV light and washing with water to create stunning white and Prussian blue images.
Glass-negative photography, which appeared in 1851, was based on the same principle as the paper negative but yielded a sharper picture, and quickly gained enormous popularity—riding a tide of consumerism that was sweeping a newly expansive Britain.
Sep 25, 2009 · Grace Seiberling's Amateurs, Photography, and the Mid‐Victorian Imagination (Chicago: University of Chicago Press, 1986) was the only book focused on this subject, but did not present a study on the British calotype.
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The calotype negative was made by projecting an image through a lens on to a piece of chemically sensitized paper fixed inside the camera. Here it formed a latent image on the paper, unseen by human eye. When developed, this produced a negative image.