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Abstract
A series of experiments was performed where emulsions were coated with a range of different image couplers and the efficiency of the coatings was investigated by using image analysis to determine the net number of developed grains. When a given emulsion was developed in a colour developer it was observed that the number of developed grains varied by a factor of two when the coupler zuas changed, which suggested that couplers have a major influence on the photographic efficiency. Much of this loss in efficiency was retrieved by the use of scavengers for oxidized developer, which indicated that latent image was lost in the early stages of development. However, there remained unknown sources of inefficiency that did not correlate well with low coupler reactivity, dispersion formulation, coupler type or, emulsion type. Additional inefficiencies zvere observed when development inhibiting couplers were added to the image couplers.
Notes
* DIR = Development Inhibitor Releasing, DIAR = Development Inhibitor Anchimeric Releasing: DI(A)R is Llsed here to indicate both types.