Black and white paper with variable gradation

摘要

A black & white paper with variable gradation containing a silver chloride-bromide emulsion, which is divided into at least three portions, one of which is sensitised with a blue sensitiser and two further portions are sensitised both with differing quantities of blue sensitiser and with differing quantities of a green sensitiser, wherein the blue sensitiser is of the formula (I) and the green sensitiser is of the formula (II) IMAGE (I) IMAGE (II) in which R1 to R8, X(-) and m have the meaning stated in the specification, is distinguished by an extended gradation range.