| abstract |
WHEREIN: R represents 1. AN ALIPHATIC GROUP INCLUDING A CYCLOALIPHATIC GROUP AND SUCH GROUPS IN SUBSTITUTED FORM, 2. AN ARYL GROUP INCLUDING A SUBSTITUTED ARYL GROUP, 3. A HETEROCYCLIC GROUP INCLUDING A SUBSTITUTED HETEROCYCLIC GROUP, OR 4. AN ACYL GROUP. Photographic recording material with a light-sensitive layer comprising a substantially non-light-sensitive silver salt, a reducing agent, a toning agent and in admixture therewith a light-sensitive heavy metal compound and/or a polymethine sensitizing agent for the spectral sensitization of the nonlight-sensitive silver compound, wherein the light-sensitive layer comprises a phthalazinone toning agent according to the following general formula: |