Diazo Intermediates for Graphic Arts

Paper presented at a Symposium on “Photographic Materials and Processes in the Printing Industry”, organized by the Scientific and Technical Group on 4–6 December 1963, in London.

Abstract

The diaza intermediate functions satisfactorily between ariginal silver positives and the sensitized metal, etc., of the final printing process. The relationship between printing light sources, the sensitivity of the diazo intermediate and the spectral absorption of the dye image have been studied relative to the spectral sensitivity of various final processes. Fluorescent tube lighting of the “actinic blue” type is preferred and involves no lack of fidelity in the intermediate image within wide exposure tolerances. Silver densities of 14 and 08 can be converted to a dye density of 17 through one and two diazo operations respectively.

Notes

Paper presented at a Symposium on “Photographic Materials and Processes in the Printing Industry”, organized by the Scientific and Technical Group on 4–6 December 1963, in London.