Silver halide emulsion containing silver ethynylcyclopentanol complex to reduce desensitization of optical sensitizing dye incorporated therein
Abstract
Abstract LIGHT-SENSITIVE PHOTOGRAPHIC SILVER HALIDE EMULSIONS ARE PROVIDED WHICH CONTAIN (1) A PHOTOGRAPHIC SPECTRAL SENSITIZING DYE HAVING A POLAROGRAPHIC CATHODIC HALFWAVE POTENTIAL MORE POSITIVE THAN ABOUT -1.80 VOLTS, SAID DYE BEING EMPLOYED IN THE EMULSION AT A CONCENTRATION WHICH RESULTS IN AT LEAST ABOUT 0.3 LOG E DESENSITIZATION OF A TEST PORTION OF THE EMULSION, WHEN THE TEST PORTION OF THE EMULSION IS COATED ON A SUPPORT, SENSITOMETRICALLY EXPOSED AND DEVELOPED FOR 6 MINUTES AT 20*C. IN KODAK D-19 DEVELOPER; AND (2) AN ORGANIC SILVER COMPLEX IN AN AMOUNT EFFECTIVE TO REDUCE THE DESENSITIZATION CAUSED BY THE SPECTRAL SENSITIZING DYE. PHOTOGRAPHIC EMULSIONS IN ACCORDANCE WITH THIS INVENTION EXHIBIT HIGHER SPEEDS IN THE SPECTRALLY SENSITIZED REGION (I.E., HIGHER MINUS BLUE SPEEDS) THAN PRIOR ART EMULSIONS CONTAINING LOWER CONCENTRATIONS OF SPECTRAL SENSITIZING DYE. IN ADDITION, USE OF THE HIGHER DYE CONCENTRATIONS IN ACCORDANCE WITH THE PRESENT INVENTION RESULTS IN EMULSIONS WHICH EXHIBIT SENSITIVITY TO LONGER WAVELENGTH RADIATION THAN PRIOR ART EMULSIONS HAVING LOWER DYE CONCENTRATIONS.
Inventors
- 👤 Paul B Gilman Jr
- 👤 Jon D Bass
Bibliographic Details
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