On the Mechanism of Photographic Development

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Abstract
Up to now it has been assumed that chemical development, which produces filamentary silver by reduction of silver ions {9m a silver halide crystal, can occur only in developer solutions with a sufficiently low value of redox potential. The present paper shows that this kind of development may also be obtained at high redox potential values. In this case the silver ions to be reduced are entirely derived from the developer solution; the silver halide crystal remains undestroyed and has a mere catalytic function in the reduction process. ls Special case of chemical development (ideal chemical development) provides a useful model for the investigation of filament formation undisturbed by secondary effects. From the experiments the conclusion is drawn that the silver filament produced by chemical development has a “root” within the silver halide lattice.

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