Mungo Ponton, William Henry Fox Talbot,
Louis-Alphonse Poitevin, John Pouncy – 1839 / 1858
Gum Print Process
Gum bichromate is a pigment photographic process invented in the mid-19th century. It uses pigments or oxides, gum arabic (acacia sap) and light-sensitive potassium dichromate.
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Van Dyke Brown
John Frederick William Herschel – 1842