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Louis Désiré Blanquart-Evrard in 1869, albumen print, by himself
The albumen print, also called albumen silver print, was published in January 1847 by Louis Désiré Blanquart-Evrard, and was the first commercially exploitable method of producing a photographic print on a paper base from a negative. It used the albumen found in egg whites to bind the photographic chemicals to the paper and became the dominant form of photographic positives from 1855 to the start of the 20th century, with a peak in the 1860-90 period. During the mid-19th century, the carte de visite became one of the more popular uses of the albumen method. In the 19th century, E. & H. T. Anthony & Company were the largest makers and distributors of the Albumen photographic prints and paper in the United States.
The paper is then dipped in a solution of silver nitrate and water which renders the surface sensitive to UV light.
The paper is then dried in the absence of UV light.
The dried, prepared paper is placed in a frame in direct contact under a negative. The negative is traditionally a glass negative with collodion emulsion, but this step can be performed with a modern silver halide negative, too. The paper with negative is then exposed to light until the image achieves the desired level of darkness, which is typically a little lighter than the end product. The progress of the print can be checked during the exposure as it is a printing-out process and the image can be seen taking form as it is being exposed to light. Though direct sunlight was used long ago, a UV exposure unit is often used contemporarily because it is more predictable, as the paper is most sensitive to ultraviolet light.
Optional gold or seleniumtoning improves the photograph's tone and stabilizes against fading. Depending on the toner, toning may be performed before or after fixing the print.
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 to light, which makes it decompose into silver and chlorine. The silver ion (Ag+) is reduced to silver (Ag) by addition of an electron during the development/printing process, and the remaining silver chloride is washed out during fixing. The black parts of the image are formed by metallic silver (Ag).
^Newhall, Beaumont (April 1955). "60,000 Eggs A Day"(PDF). Image, Journal of Photography of George Eastman House. Rochester, N.Y.: International Museum of Photography at George Eastman House Inc. IV (4): 25-26. Archived from the original(PDF) on 4 March 2016. Retrieved 2014.
^Welling, William. Photography in America (1978 & 1987)
Marshall, F.A.S. Photography: the importance of its applications in preserving pictorial records. Containing a practical description of the Talbotype process (London: Hering & Remington; Peterborough, T Chadwell & J Clarke, 1855).