— Albumen on glass plates first employed for making negatives by M. Niépce de Saint Victor. Process published June 13th.
— Frederick Scott Archer experimented with paper pulp, tanno-gelatine, and iodised collodion, and made collodion negatives in the autumn.
1849. Collodion positive of Hever Castle, Kent, made by Frederick Scott Archer early in the year.
— M. Gustave Le Gray suggested the application of collodion to photography.
1850. “A Practical Treatise on Photography upon Paper and Glass,” by Gustave Le Gray. Translated from the French by Thomas Cousins, and published by T. and R. Willats. This book is said to contain the first printed notice of collodion being used in photography.
— R. J. Bingham, London, suggested the use of collodion and gelatine in photography.
— M. Poitevin’s gelatine process, published January 25th.
1851. Frederick Scott Archer published his collodion process in the March number of The Chemist, and introduced pyrogallic acid as a developer December 20th.
— Fox Talbot announced his instantaneous process, and obtained, at the Royal Institution, a copy of the Times newspaper, while revolving rapidly, by the light of an electric spark.
— Niépce de St. Victor’s heliochromic process, published June 22nd. Examples sent to the judges of the International Exhibition of 1862. See Jurors’ Report thereon, pp. 88-9.