The effect of gelatin on pure physical development was studied for developers containing a different developing agents.
It was observed that the developing curves consisted of two stages: the earlier stage in which an increasing developed silver was constant and the later stage in which it decreased with development time.
Development in earlier stage was found to be retarded by gelatin. The degree of retardation could be classified by the magnitude of the charge of developing agents. On the other hand, that in later stage was found to be accelerated by gelatin.
It can be explained in terms of the effect of competitive adsorption with gelatin, the developing agent and its oxidation products as follows. In earlier stage, gelatin adsorbs on the surface of development nuclei and decreases its active surface area. In later stage, gelatin inhibits the adsorption of oxidation products and decreases their development-restraining action.
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