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.
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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.