Abstract: Solid particle dispersions of blocked developers useful in imaging elements can be made with substantially improved stability to particle growth by dispersing the blocked developer of interest in the presence of a relatively small amount of an additional blocked developer that is structurally similar to the main blocked developer of interest. This additional blocked developer can be combined with the main blocked developer of interest prior to dispersing the main blocked developer of interest, i.e., prior to milling in the case of milled dispersions, and prior to precipitation in the case of pH or solvent precipitated dispersions.

Abstract: A color photographic element for use with a latent or silver image intensification or amplification method which incorporates a blocked color developing agent. The color photographic element includes at least one silver halide emulsion layer which includes at least about 70 mole percent chloride and has a concentration of silver within the range of about 0.1 mg/m.sup.2 to 2000 mg/m.sup.2. The blocked color developing agent is capable of being unblocked during photographic processing by means of reaction with a dinucleophile reagent. A preferred dinucleophile reagent is hydrogen peroxide, which also acts as an oxidant in the latent or silver image intensification method.