Black and white paper with variable gradation

Year	Description
1996	Invention patented by Manfred Peters, Thomas Kaluschke, Hans Ohlschlager, and Bruno Mucke on July 21th, 1996. Abstract: 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) ##STR1## in which R.sub.1 to R.sub.8, X.sup.(-) and m have the meaning stated in the specification, is distinguished by an extended gradation range.
Source: selected by the editor from original sources.

Invention: Black and white paper with variable gradation