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Abstract
The behaviour of large silver-bromide crystals (approximately 5-20μ in diameter) on exposure and development has been studied. The principal characteristic curves, analogous to those of silver bromide sols, have been obtained, which show that these crystals behave photographically like sols. Since the grain sizes of sols and large crystals span the range normally investigated in photographic research, it is considered that the behaviour of sols and crystals is characteristic of silver-bromide crystals in general, any quantitative variations being due to differences in surface-to-volume ratio. The suggestion that spontaneous sensitization by gelatin is due to reduction is rejected. The notion that silver sulphide functions primarily as a bromine (positive hole) acceptor is not confirmed.