The working hypothesis behind the whole of the information presented, was that even by strong developers not all the dispersed silver germs, forming the corpuscular latent images, are developed. Activation of these "sub-image" specks, after exposure but before development, might then result in an increase of the number of deve¬loped silver grains.nHomogeneous activation of the emulsion layers was obtained by treatment with a gold solution before development in amidol or other chemical developers.
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