In contrast to tinting, toning is not the simple immersion of a film into a dye bath but involves a chemical reaction converting the silver image. In this reaction the neutral silver image in the emulsion of the positive film is replaced by one consisting of colored metal compounds. These were usually iron ferrocyanide (Prussian Blue) for blue, copper ferrocyanide for red/brown, silver sulfide for sepia or rarely uranium ferrocyanide for reddish brown. Toning had been used in still photography before. But since film was projected on the screen it required translucent toning compounds.
For tinting, the positive print is immersed into a variety of dye baths, scene by scene. To this end, the print has to be cut into the corresponding fragments and reassembled after the dyeing process. The dye homogeneously attaches over the entire image’s gelatin including the perforation area. Usually synthetic dyes were dissolved in a weak acid solution to form a chemical bond with the gelatin.
Frame characteristics / features of margins: Ambrosio. Cf.: Brown, Harold (1990): Physical Characteristics of Early Films as Aids to Identification. Brussels: FIAF, on p. 24.
Skleněné varhany (Stěklanna je garmonika, Andrej Chržanovskij, USSR 1968). Credit: Národní filmový archiv / National Film Archive, Prague. Photograph by Barbara Flueckiger
Photomicrograph 1000x, Agfachrome cross section. Credit: Carsta Knaack.
Photomicrograph 500x, faded 3M print, cross section. Credit: Karsta Knaack.
Credit: Illustration by Sarah Steinbacher, Multimedia & E-Learning-Services, University of Zurich. Source: Ryan, Roderick T. (1977): A History of Motion Picture Color Technology. London: Focal Press.
Hongarije (FRA 1926, Anonymous). Credit: EYE Film Museum. Photographs of the tinted, toned and stencil colored nitrate print by Olivia Kristina Stutz, ERC Advanced Grant FilmColors.
Salomé (USA 1922, Charles Bryant). Credit: George Eastman Museum. Photographs of the tinted, toned and Handschiegl nitrate print by Barbara Flueckiger.
Source: Coe, Brian (1981): The History of Movie Photography. Westfield, N.J.: Eastview Editions. Film: Pagliacci (1937).
Rouxcolor, four-color, black and white negative and positive, ca. 1948. Credit: Gert Koshofer Collection. Sample No. 83. Photograph by Barbara Flueckiger
Credit: Illustration by Sarah Steinbacher, Multimedia & E-Learning-Services, University of Zurich. Source: Cornwell-Clyne, Adrian (1951): Colour Cinematography. London: Chapman & Hall.
Rota Farbenfilm Samples (Kodak Film Samples Collection). Credit: National Science and Media Museum Bradford. Photographs of the Rotacolor Prints by Josephine Diecke, SNSF project Film Colors. Technologies, Cultures, Institutions and Joëlle Kost, ERC Advanced Grant FilmColors.
Source: Jacobson, Egbert (1942): The Color Harmony Manual and How to Use It. Chicago: Color Laboratories Division, Container Corp. of America. Credit: Faber Birren Collection, Yale University. Photograph by Barbara Flueckiger.
Didone abbandonata (ITA 1910, Luigi Maggi).
Credit: Cineteca di Bologna.
Photographs of the tinted nitrate print by Barbara Flueckiger.