Louis Désiré Blanquart-Evrard

Louis Désiré Blanquart-Evrard was a cloth merchant from Lille, France who learned the calotype process from his druggist, a student of the inventor of the calotype, William Henry Fox Talbot. He developed a method of bathing the paper in solutions of potassium iodide and silver nitrate rather than brushing the chemical baths on the surface. In 1850 Blanquart-Evrard published the Albumen Print also called "The Albumen Silver Print." This was the first 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 print on a paper base from a negative. It became the dominant form of photographic positives from 1855 to the start of the 20th century. In the 1860s he published several books where he described the first three decades of the progress of photography and his outlook for the future development of photography.