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Abstract
A rapid developing system with a high contrast comparable to that of the lith system is described. The mechanism of the high contrast development has been investigated by using a model system. It has been found that a considerable amount of semiquinone is formed in a high pH and high-sulphite developer and a specific retardation effect by some antifogging agents enhances a contrast of a characteristic curve. By use of this system “fine line reproduction in superimposition” and other contact printing works can be better achieved with rapid access.
Notes
Paper presented at a symposium on “Photography in the Printing Industry” organized by the Scientific & Technical Group of The Royal Photographic Society, 13-16 September 1983 at New College, Oxford. MS received 3 May 1984.