Abstract
THIRTY years ago, Sheppard1 isolated allyl isothiocyanate from extracts of photographically active gelatins. It has since been made evident that this sulphur sensitizer is not usually present in gelatins produced by existing methods. Steigmann2 has demonstrated by chemical tests the presence in lime-treated hide gelatins of thiosulphate and trithionate ions, and has indicated a mode of formation of these sensitizing substances by alkaline degradation of cystine. Wood3,4 has applied paper chromatography and paper electrophoresis to extracts from gelatins, and has detected thiosulphate and polythionates. He has suggested alternative mechanisms of sensitizer formation, including oxidation of sulphides used for depilatory purposes in gelatin precursor treatment, and also oxidation or autoxidation of sulphur dioxide. The purpose of the present communication is to indicate that a quantitative method has been devised for determining sensitizers in gelatin extracts.
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References
Sheppard, S. E., Phot. J., 65, 380 (1925).
Steigmann, A., Sci. et Indust. Phot., 22, 441 (1951).
Wood, H. W., Sci. et Indust. Phot., 23, 209 (1952).
Wood, H. W., J. Phot. Sci., 2, 154 (1954).
Furness, W., and Davies, W. C., Analyst, 77, 697 (1952).
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RUSSELL, G. Photographic Sensitizers in Gelatin. Nature 178, 280 (1956). https://doi.org/10.1038/178280a0
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DOI: https://doi.org/10.1038/178280a0
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