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Abstract
In the post-war Graphic Arts Industry, lith materials became very important, because they allowed, in a single process, the transformation of a continuous tone picture into a halftone with sharp, well formed dots. The hypothesis that the lith effect results from development acceleration by semiquinone is still widely accepted. Firstly, the properties of the fdm and processing chemistry which arc needed for the best possible lith result are described. The effects of the most important components in the developer on the overall development process and on the reduction of the single grain are considered. The final part will deal with possible mechanisms. Observations are presented which contradict accepted theories of lith development, but which may be explained with the help of more modern concepts.
Notes
Paper presented at a symposium on “Photography in the Printing Industry” organized by the Scientific and Technical Group of The Royal Photographic Society, 13-16 September 1983 at New College, Oxford.