Number and Distribution of Latent Image Specks Inside the Emulsion Grains

Paper presented at a Colloquium on “The Science of Photography”, 23–28 September 1963, in Turin.

Abstract

The method of “differential development” is applied to study the distribution of the latent-image specks within the volume of the emulsion grains as well as to determine their absolute number. The results obtoined show that the number of internal specks per developable grain increases rapidly with exposure, reaching ten even below the shoulder of the characteristic curve. The concentration of specks on the surface is. however. always much larger than that inside the grains. indicating the significance of the free surface for the process of latentimage formation. The distribution of the specks among the different grains of the emulsion does not seem to be random. specks being formed preferentially in some of the grains.

Notes

Paper presented at a Colloquium on “The Science of Photography”, 23–28 September 1963, in Turin.