Spectrally sensitized photographic silver halide emulsions, useful in e.g. color negative, reversal or positive film, paper or dye diffusion transfer or silver dye bleach material, contain 4-hydroxy-3-oxo- or 3-imino-pyrazoline compound

In spectrally sensitized photographic silver halide emulsions, the emulsion is treated, after precipitation, with 1-alk(en)-, -ar(alk)yl or heterocyclyl-4-hydroxy- or -amino-3-oxo- or -3-imino-pyrazoline compound(s). In spectrally sensitized photographic silver halide emulsions, the emulsion is treated, after precipitation, with 1-alk(en)-, -ar(alk)yl or heterocyclyl-4-hydroxy- or -amino-3-oxo- or -3-imino-pyrazoline compound(s) of formula (I). [Image] R1>optionally substituted alkyl, aryl, aralkyl, alkenyl or heterocyclyl group; R2>hydrogen (H) or an optionally substituted alkyl, aryl, heterocyclyl, amino or alkoxy group; R3>H or an optionally substituted alkyl, aryl, aralkyl or heterocyclyl group; D : hydroxyl (OH) or amino (-N(R4>)R5>); X : oxygen (O) or imino (NR6>); R4>, R5>H or as R1>; R6>H or an optionally substituted alkyl, aryl, aralkyl, alkenyl, acyl, alkoxycarbonyl, carbamoyl or heterocyclyl group; or R1>->6> in pairs : group forming a heterocycle, e.g. a pyrrolidine, piperidine, perhydroazepine, piperazine, morpholine or thiomorpholine ring. An independent claim is also included for photographic material with a base and silver halide emulsion layer(s), including at least one layer of emulsion(s) of the above type. In spectrally sensitized photographic silver halide emulsions, the emulsion is treated, after precipitation, with 1-alk(en)-, -ar(alk)yl or heterocyclyl-4-hydroxy- or -amino-3-oxo- or -3-imino-pyrazoline compound(s). In spectrally sensitized photographic silver halide emulsions, the emulsion is treated, after precipitation, with 1-alk(en)-, -ar(alk)yl or heterocyclyl-4-hydroxy- or -amino-3-oxo- or -3-imino-pyrazoline compound(s) of formula (I). R = optionally substituted alkyl, aryl, aralkyl, alkenyl or heterocyclyl group; R = hydrogen (H) or an optionally substituted alkyl, aryl, heterocyclyl, amino or alkoxy group; R = H or an optionally substituted alkyl, aryl, aralkyl or heterocyclyl group; D = hydroxyl (OH) or amino (-N(R )R ); X = oxygen (O) or imino (NR ); R , R = H or as R ; R = H or an optionally substituted alkyl, aryl, aralkyl, alkenyl, acyl, alkoxycarbonyl, carbamoyl or heterocyclyl group; or R in pairs = group forming a heterocycle, e.g. a pyrrolidine, piperidine, perhydroazepine, piperazine, morpholine or thiomorpholine ring. An Independent claim is also included for photographic material with a base and silver halide emulsion layer(s), including at least one layer of emulsion(s) of the above type. Eine spektral sen