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The salt print was the dominant paper-based photographic process for producing positive prints (from negatives) from 1839 until approximately 1860. Saint Michael's Church, Winterbourne, April 1859, salted-paper print, Department of Image Collections , National Gallery of Art Library, Washington, DC
After the plate is washed with salt water, the image appears, reversed. This was the earliest photographic process to gain popularity in America. [3] It was used until around 1860. [4] 1839: Salt print This was the dominant form of paper print until Albumen prints were introduced in 1850. Salt prints were made using both paper and glass negatives.
The compound may be more stable than metallic silver and may also have a different color or tone. Different toning processes give different colors to the final print. In some cases, the printer may choose to tone some parts of a print more than others. [1] Toner also can increase the range of shades visible in a print without reducing the contrast.
Because the image emerges as a direct result of exposure to light, without the aid of a developing solution, an albumen print may be said to be a printed rather than a developed photograph. The table salt (sodium chloride) in the albumen emulsion forms silver chloride when in contact with silver nitrate. Silver chloride is unstable when exposed ...
The "calotype", or "talbotype", [10] was a "developing out" process, Talbot's improvement of his earlier photogenic drawing process by the use of a different silver salt (silver iodide instead of silver chloride) and a developing agent (gallic acid and silver nitrate) to bring out an invisibly slight "latent" image on the exposed paper. This ...
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A gelatin silver print is composed of four layers: paper base, baryta, gelatin binder, and a protective gelatin layer or overcoat. The multi-layer structure of the gelatin silver print and the sensitivity of the silver imaging salts require specialized coating equipment and fastidious manufacturing technique to produce a consistent product that ...