Agfa-gevaert

Detlev Kapitza

Peter Bergthaller

Hans-Ulrich Borst

Klaus Wagner

Peter Bell

Thomas Stetzer

Lothar Endres

Ralf Wirowski

Heinrich Odenw&auml;lder

J&ouml;rg Siegel

Heinz Sch&uuml;tz

Color photographic silver halide material

The production of tabular silver bromide-iodide emulsions and silver bromide-chloride-iodide emulsions with an aspect ratio,, an iodide content from 1 to 40 mol % and a chloride content from 0 to 20 mol %, by the process steps of (a) silver halide nucleus precipitation, and (b) at least one further precipitation of silver halide, wherein rein at least one aromatic five- or six-membered, heterocyclic compound, which is free from&mdash;SH&mdash;,&mdash;SSO,H&mdash; and&mdash;SSO,R groups, is added in an amount from 10,to 10,mol/mol silver during nucleus precipitation or during the precipitation of an inner zone of the silver halide grain which is different from the nucleus precipitate, results in an improved speed/grain size ratio and in an increased stability of a photographic material which contains an emulsion produced in this manner.

Production of silver halide emulsions

Growing community of inventors

Leverkusen, Germany

Detlev Kapitza