[Dr. John M. Gray, surgeon for the 39th Indiana Regiment, head-and-shoulders portrait, facing front] / Cox & Clark, Metropolitan Photograph Gallery, Indianapolis.

In: Adolph Metzner photograph album ..., no. 18.

The albumen silver print is a photographic printing process that was widely used in the 19th century. It involves coating paper support with a mixture of egg whites and salt, which creates a glossy surface to hold light-sensitive silver salts. The paper is then sensitized in a solution of silver nitrate, and exposed in a camera or under a negative. After exposure, the print is developed in a solution of gallic acid and silver nitrate, which reduces the silver salts to metallic silver and creates the final image. The albumen print process was widely used for commercial and fine art photography in the 19th century and produced high-quality, detailed images with a distinctive glossy finish.

Heer indiana infantry regiment 39th Personen Geschichte Bürgerkrieg Albumin Drucke cartes de visite Portraitfotos John grau der Chirurg Regiment indisches Regiment Porträt Steuermann Clark Metropolitan- Galerie metropolitan photograph gallery Indianapolis 1861 Kopf- und Schulterportrait 19. Jahrhundert Los 8751 Foto ultrahohe Auflösung hohe Auflösung die Geschichte der Vereinigten Staaten Offizier Militäruniformen Kongressbibliothek Porträt nach vorne gerichtet

01/01/1861

Library of Congress

http://www.loc.gov/

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