JAIC 1999, Volume 38, Number 2, Article 2 (pp. 124 to 143)
JAIC online
Journal of the American Institute for Conservation
JAIC 1999, Volume 38, Number 2, Article 2 (pp. 124 to 143)

DIFFERENCES IN IMAGE TONALITY PRODUCED BY DIFFERENT TONING PROTOCOLS FOR MATTE COLLODION PHOTOGRAPHS

SYLVIE PENICHON



NOTES

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:

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.

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).



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FURTHER READING

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.


AUTHOR INFORMATION

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.


Copyright © 1999 American Institute for Conservation of Historic and Artistic Works