Light-handleable photographic materials

Claim 1

A sensitised ammoniacal silver halide emulsion in which the silver halide grains have been formed and grown in the presence of ammonia and an excess of chloride ions, consisting of at least 50 mole % of silver chloride, the remaining silver halide, if any, being silver bromide and/or silver iodide with a maximum of 1 mole % of silver iodide, the arithmetic mean grain size of the silver halide grains being from 0.5 to 1.5 microns, and having a δ g is not more than 1.35, the emulsion having a maximum chemical fog of 0.1 over base when spread as a layer on each side of a polyester film base at a total coating weight of 8 g silver per square meter of base such that upon image-wise exposure to radiation of 460 to 520 nm and development for 21/2 minutes at 20° C. in a developer comprising: ______________________________________ methyl-p-aminophenol sulfate 2.2 g hydroquinone 8.8 g sodium carbonate 48.0 g sodium sulfite 72.0 g potassium bromide 4.0 g hexametaphosphate 2.2 g distilled water to 1000 ml ______________________________________ followed by conventional rinsing, fixing, and drying, gives an optical density of no more than 0.1 above chemical fog plus base, where said image-wise exposure is to 0.2 erg/mm 2 of an equi-energy spectrum light restricted to a wavelength band of 460 to 520 nm.

Claim 14

A method of forming a silver halide emulsion having a sensitivity to radiation such that upon image-wise exposure to radiation of 460 to 520 nm and development for 21/2 minutes at 20° C. in a developer comprising: ______________________________________ methyl-p-aminophenol sulfate 2.2 g hydroquinone 8.8 g sodium carbonate 48.0 g sodium sulfite 72.0 g potassium bromide 4.0 g hexametaphosphate 2.2 g distilled water to 1000 ml ______________________________________ followed by conventional rinsing, fixing, and drying, gives an optical density of no more than 0.1 above chemical fog plus base comprising at least 50% silver chloride, the remainder comprising silver bromide or silver iodide with no more than 1% silver iodide, having a mean grain size from 0.5 to 1.7 microns and a δ g of no more than 1.35 comprising growing silver halide grains in the presence of ammonia, excess chloride ion and an azaindene growth controller in an amount from 0.00001 to 0.0005 moles per mole of silver halide.

Claim 15

A method of forming a silver halide emulsion having a sensitivity to radiation such that upon image-wise exposure to radiation of 460 to 520 nm and development for 21/2 minutes at 20° C. in a developer comprising: ______________________________________ methyl-p-aminophenol sulfate 2.2 g hydroquinone 8.8 g sodium carbonate 48.0 g sodium sulfite 72.0 g potassium bromide 4.0 g hexametaphosphate 2.2 g distilled water to 1000 ml ______________________________________ followed by conventional rinsing, fixing, and drying, gives an optical density of no more than 0.1 above chemical fog plus base comprising at least 50% silver chloride, the remainder comprising silver bromide or silver iodide with no more than 1% silver iodide, having a mean grain size from 0.5 to 1.7 microns and a δ g of no more than 1.35 comprising growing silver halide grains in the presence of ammonia, excess chloride ion and an azaindene growth controller in an amount from 0.00001 to 0.0005 moles per mole of silver halide.