Kopiermaterial für die photomechanische Herstellung von Flach- und Offsetdruckformen

摘要

Printing forms for flat-bed and off-set printing are produced by dissolving a double salt of a metal with a salt of a diazonium cpd. obtained by acid condensation of diphenylamine-4-diazonium salt with formaldehyde, with 0.01-100 Mol. phosphoric acid per equivalent weight diazonium groups, and coating the aluminium support. Double salts are zinc chlirde and cadmium chloride double salts.