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Abstract
Experimental evidence is presented in this paper in support of a hypothesis of a dual mechanism of latent-image formation, such as was suggested in previous communications. The time-scale characteristic curves of silver-bromide sols are shown to be composites of two curves if the sols are developed under certain defined conditions; the two curves originate from the two mechanisms of latent-image formation, viz. from a surface complex and from the lattice proper, a “complex” and a “crystal” image being produced. The two mechanisms are shown to possess different spectral sensitivity characteristics.
The terms “complex” and “crystal” image are discussed in relation to conventional terms, such as the “surface” and the “internal” image.
It is suggested that the dual mechanism of latent-image formation is a general feature not only of sols but also of photographic emulsions.