The growth and the decay of latent-image specks Ag_n⁺ in redox buffers are discussed, based on the assumption that the specific rates of growth and decay of Ag_n⁺ are proportional to the distribution of electrons in the lowest unoccupied level of Ag_n⁺ and to the distribution of electron vacancies in the highest occupied level of Ag_n⁺, respectively. The mechanisms of the reduction of unexposed silver halide grains and of the development are also suggested. Conclusion;(1) The larger specks than a certain size cannot be distinguished clearly from others by the redox buffer.(2) “ The redox potential of the latent-image” is not same in nature as the thermodynamically defined potential, but its nature approaches to the thermodynamical one with increase of the size of the speck.(3) It is barely possible to obtain approximate values of quasi-Fermi levels of the specks by the measurements using the redox buffers, but the discrete level of the small specks could not be found by refinements in technique.(4) Ag⁺ at kink site cannot decay and has an only probability to grow to Ag₂⁺, and a metallic silver is most stable in the redox buffer. These lead to further growth to Ag₃⁺, Ag₄⁺, Ag₅⁺ and so on. Therefore, if the redox potential of a reducing solution is more negative than the silver potential in the same solution, the pure, unexposed silver halide grains can be reduced to metallic silvers.(5) The lowest unoccupied levels of Ag⁺ (kink), Ag₂⁺ and Ag₃⁺ lie so high from Fermi level of the developer that their rates of growth are very slow. Once the speck grow up to provide an unoccupied level as high as Fermi level of the developer, the speck can grow very rapidly. Latent-image speck provides such level on the surface of the silver halide grain.