Proceedings PaperNew rehalogenating bleach for the production of Lippmann holograms
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Mass produced silver halide Lippman holograms have tended to suffer from two drawbacks. Firstly reflectivity has been low due to the removal of silver halide at the bleach stage and secondly the replay wavelength has tended to be green owing to the difficulty of maintaining colour consistency in the yellow region for a process in which the colour is exposure dependent. A new, machine compatible, rehalogenating bleach now makes replay colour independent of exposure and gives brighter holograms. The methods of preparation and disposal of the new bleach also make it more environmentally acceptable and contribute to cost reduction in the manufacture of the holograms. The new bleach is part of film, developer, bleach system which can be used either for room temperature dish processing, desk top machine processing or mass production.