Sub-Image Formation by Oxidation of Latent Image

Abstract

We demonstrate that various combinations of sensitization, exposure time, and rate of oxidation produce sub-image centres if latent image centres in silver bromide grains are carefully oxidized. First we confirm that sub-image is formed by relatively slow oxidation of latent image in sulphur-plus-gold-sensitized grains exposed for 10^–10s. An increase in the rate of oxidation leads to the same result. Relatively slow oxidation of latent image in unsensitized grains exposed for 10^–10s and in sulphur-sensitized grains exposed at 10^–10s also produces sub-image.