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Abstract
Factors determining the pattern of grain development, either in parallel or sequential, are discussed both for image development and fog formation. Lith development, as a typical example of parallel grain development, is discussed in more detail.
That development may proceed with either parallel or sequential grain reduction is not merely an experimental phenomenon, the different modes lead to different patterns of density growth. Only when grains develop in parallel can the rate of density growth give information about the rate at which a single grain develops. The relationship of high contrast to parallel development is indicated by considering the similar kinetics shown by lith, parallel, and single-grain development.
A phenomenon occuring in the induction period is presented to explain the dependence of the induction period on exposure, which is required for producing the lith effect.