An Investigation of the potential mobility of gold ions in core/shell silver bromide emulsions

The degree to which non-localized gold ions migrate to the surface from the core of a silver bromide core/shell octahedral emulsion in the absence of sulfur sensitization is investigated. An octahedral core emulsion is precipitated in an oxidized gelatin environment, sensitized with gold, and covered with an additional layer of silver bromide. It was postulated that the migration of gold might be detected by a significant increase in the surface speed of the emulsion due to the catalytic enhancement of latent image formation typified by gold, and an increase in the tendency of the system to form developable sites on the grain surfaces upon application of a solution of stannous chloride. The results were less than conclusive