Van Dyke Brown

            The Van Dyke Brown printing process, named after the deep brown pigment that was often used by Flemmish painter Van Dyck, is an early photographic process that uses silver tartrate, creating a unique brown image.

            Developed in 1889, this solution involves mixing silver nitrate with tartaric acid and ammonium ferric citrate. Several washes of water are used to remove the water soluble iron and silver salts.