DIFFERENCES IN IMAGE TONALITY PRODUCED BY DIFFERENT TONING PROTOCOLS FOR MATTE COLLODION PHOTOGRAPHS
1. Chloride of gold = gold (III) chloride; sulphocyanide of ammonia = ammonium thiocyanate; sel d'or = gold chloride used in combination with sodium thiosulfate (see table 2, combined toning/fixing); hyposulfite of soda = sodium thiosulfate.
2. Hasluck (1906) gives the following proportions of gold for different tones:
Mass equivalent (grain) was derived based on the assumption of a 1% solution. There are approximately 17 British minims per ml, and approximately 65 mg in a grain (Nishimura 1998).
Eight minims (3/40 grain) = purple black; four minims (3/80 grain) = purple; three minims (3/100 grain) = brown; two minims (1/50 grain) = warm brown; one minimum (1/100 grain) = red.
AristoEagle. 1901. Aristo motto. Aristo Eagle1(2): 1.
AristoEagle. 1905. Aristo Eagle. 5(1): 16–17.
AristoEagle. 1905. Aristo self-toning ad. Aristo Eagle5(11): 26.
AristoEagle. 1906. Platinum goes up again. Aristo Eagle6(8): 20.
AristoEagle. 1908. Aristo self-toning ad. Aristo Eagle7(4): 22.
Baker, T. T.1904. Printing-out papers. Photo-Miniature6(6):469–99.
Bentzen, T.1926. Emulsions and baryta coating. British Journal of Photography73 (January):59–62, 73 (August):499–500.
Bothamley, C. H. n.d. The Ilford manual of photography. London: Ilford, Ltd.
Burbank, W. H.  1973. Photographic printing methods. Reprint, New York: Arno Press.
Clerc, L. P.1937. Photography, theory, and practice. 2d ed.. New York: Pitman Publishing Co.
deCaranza, E.1856. Nouveau proc�d� de fixage des �preuves positives au moyen du chlorure de platine. La Lumi�re6(8):29.
Eder, M. J.  1972. History of photography, trans. Edward Epstean. Reprint, New York: Dover Publications.
Fabre, C.1890. Trait� encyclop�dique de photographie. 2 vols. Paris: Gauthier-Villars.
Fizeau, H.1841. Sur un moyen de fixer les images photographiques. Comptes rendus hebdomadaires des s�ances de l'Acad�mie des sciencesII:237–38.
Harrison, J. W.1887. Chapters in the history of photography. Collodion emulsion. Photographic Times and American Photographer17 (June):225.
Harrison, J. W.1892. The toning of photographs considered chemically, historically and generally. In The chemistry of photography. New York: Scovill and Adams Co.334–359.
Hasluck, P. N., ed.1906. The book of photography, practical, theoretic and applied. London: Cassel & Co.
Jenkins, R. V.1975. Images and enterprise: Technology and the American photographic industry, 1839 to 1925. Baltimore and London: Johns Hopkins University Press.
Lav�drine, B.1990. Les Aristotypes, pt. 1. Preprints, ICOM Committee for Conservation, 9th Triennial Meeting, Dresden. Paris: ICOM. 235–61.
Lav�drine, B.1991. Les Aristotypes. Les documents graphiques et photographiques: Analyse et conservation. In Travaux du CRCDG 1988–1989. Paris: Archives nationales, La Documentation fran�aise. 149–219.
Lee, W. E.1987. Toning: Its invention and expanding role in photography. In Pioneers of photography, ed.E.Ostroff. Springfield, Va.: Society for Imaging Science and Technology. 72–78.
Legros, V.1891. L'Aristotypie. Paris: Soci�t� d'�ditions scientifiques, Biblioth�que g�n�rale de photographie.
Nadeau, L.1982. History and practice of carbon process. Fredericton, Canada: Atelier Luis Nadeau.
Nadeau, L.1986. History and practice of platinum printing. Fredericton, Canada: Atelier Luis Nadeau.
Nadeau, L.1989. Encyclopedia of printing, photographic, and photomechanical processes. 2 vols. Fredericton, Canada: Atelier Luis Nadeau.
Nishimura, D.1998. Personal Communication. Image Permanence Institute, Rochester, N.Y.
Photo-Miniature. 1907. Printing processes described. Photo-Miniature7 (78):263–71.
Photo-Miniature. 1910. Six photographic printing processes. Photo-Miniature9 (108):531–75.
Reilly, J. M.1986. Care and identification of 19th-century photographic prints. Rochester, N.Y.: Eastman Kodak Co.
Salmon, P. R.1921. The modern history and manipulation of self-toning paper. British Journal of Photography68 (December 9):730.
Simpson, G. W.1865. On a new method of printing and the preparation and use of collodio-chloride of silver. Paper presented at a meeting of the London Photographic Society March 14. Photographic News9 (341):121–23.
Spiller, J.1870. The collodio-chloride process. The Photographic News14 (March 25):136–37.
Sturge, J. M.1977. Neblette's handbook of photography and reprography. 7th ed.New York: Van Nostrand.
The Amateur Photographer. 1925. August 12, 30.
Wallace, E.1888. Printing methods. American Journal of Photography9 (7):163–65.
Welling, W. B.1978. Photography in America: The formative years, 1839–1890—A documentary history. New York: Thomas Y. Crowell Co.
Wentzel, F.1960. Memoirs of a photochemist. Ed.Louis WaltonSipley. Philadelphia, Pa.: American Museum of Photography.
Werge, J.  1973. The evolution of photography. Reprint, New York: Arno Press.
Willis, W.1873. Improvements in photo-chemical printing. British Patent #2011, June 5, 1873. Reprinted in Nadeau 1986.
Woodbury, W. E.1893. Aristotypes and how to make them. New York: Scovill & Adams Co.
Woodbury, W. E.  1979. The encyclop�dic dictionary of photography. New York: Scovill & Adams Co. Reprint, New York: Arno Press.
Wypyski, M.1998. Personal communication. The Metropolitan Museum of Art, New York.
Baker, T. T.1948. Photographic emulsion technique. Boston: American Photographic Publishing Co.
Burbank, W. H.1891. Platinum toning. American Amateur Photographer3 (7):249–52.
Crawford, W.1970. The keepers of light: A history and working guide to early photographic processes. Dobbs Ferry, N.Y.: Morgan & Morgan.
Formstecher, F.1921. The production of various colours on gold toned prints. Photographische Rundschau57:162–64.
Hanneke, P.1897. Das celloidinpapier, Seine Herstellung und Verarbeitung. Berlin: Verlag von Gustav Schmidt.
Morgan, W. D.ed.1949. Encyclopedia of photography. New York: National Educational Alliance.
Neblette, C. B.1927. Photography: Its principles and practice. New York: D. Van Nostrand.
Reilly, J. M.1980. Albumen and salted paper book. Rochester, N.Y.: Light Impressions.
Wall, E. J.1929. Photographic emulsions. Boston: American Photographic Publishing Co.
Wall, E. J.1940. Photographic facts and formulas. 2d ed.F. I.Jordan. Boston: American Photographic Publishing Co.
SYLVIE PENICHON graduated cum laude from the Federal University of Rio de Janeiro, Brazil, with a B.A. in communications. She received a certificate of training in photographic preservation and archival practice from the George Eastman House, Rochester, New York. She received her M.A. in art history and diploma in conservation from the Institute of Fine Arts, New York University, specializing in the conservation of photographs. She is currently an Andrew W. Mellon Fellow in photograph conservation at the Art Institute of Chicago.