Silberhalogenid-Aufzeichnungsmaterial mit verbesserter Lagerungsbeständigkeit zur Erzeugung von Negativbildern mit ultrasteilem Kontrast

摘要

Photographic silver-halide materials for producing negatives with ultrahard-gradation gamma contrast, which contain a hydrazine compound and a contrast-boosting amino compound and/or phosphonium compound, demonstrate an undesirable increase in fog during storage. By adding a sulphite salt to the emulsion, storage-stable materials are obtained in which sensitivity and contrast are increased. The invention can be used to produce images during reproduction in the pre-printing stage.