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Abstract
The spectral sensitivity of a spectrally sensitized emulsion is in many cases altered by the addition of colour couplers. This alteration is mainly due to a partial desorption of the sensitizing agent. Two possible cases of interaction between the colour coupler and the sensitizer hare been studied.
1. The colour coupler itself is not adsorbed on the surface of the silver halide but forms micelles in the gelatin phase. These micelles act as dissolving agents and desorb the sensitizing agent from the surface of the silver halide crystals. The isotherm, giving the amount of sensitizer solubilised by the colour coupler as a function of the amount still adsorbed on the silver halide crystals, has two different saturation levels.
2. The colour coupler is adsorbed In this case the colour coupler and the sensitizing agent scarcely disturb the adsorption of each other A multilayer adsorption is believed to take place
Notes
Research made with the support of the “Institute to Aanmoediging van het wetenschappelijk Ondetrock in Nijverheid en Landbour” of Belgium. Paper presented at symposium on Adsorption at Silver Halide Surfaces Organised by the Scientific and Technical Group on March 1 April 1965 in Bristol