The phrase "albumen print" refers to a type of photograph that was popular during the 19th century. It is made by placing an egg white solution onto photographic paper, which creates a glossy and detailed image when exposed to light. Full definition
Albumen print from wet plate collodion negative Courtesy the artist and Howard Greenberg Gallery (aperture.org)
They encompass a wide historical range, from William Strudwick's gorgeous albumen prints of 19th century London (which bring to mind the work of Parisian photographer Charles Marville) to Robert Brownjohn's 1961 street photos of the city's urban typography. (americanphotomag.com)
Anonymous Untitled (Indian nobleman), date unknown 5 1/2 x 4 inches Hand - colored albumen print on cabinet card (howardgreenberg.com)