Abstract
The production of a latent image in photographic emulsions by friction, and the desensitization of the emulsions to subseuqent illumination, both by friction and inhomogeneous pressure, has been investigated. It is suggested that the grains of silver halide are deformed by pressure and form internal faults which act as latent image traps. This causes the desensitizing effect. If the forces are sufficient to shear the grains, then a latent image is formed which can be developed by an ordinary developer. The mechanism whereby this latent image is formed is not clear, but thermal effects probably play the main part.
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