HISTORY OF the PHOTOGRAPHY Seen of a bridge on the P?near Country house M. of F. Black persons (6x7) 1890 approximately. First experiments on the color photograph; with the method of the additiva synthesis. Eliografia to indirect colors; eliocromia on gelatin bichromate and pimgento to the coal (red/blue/yellow) filters green/orange/violetto. Francesco Negri; of Casale Monferrato was a great investigator of the photographic techniques.