Abstract: Emulsions having an improved sensitivity/grain ratio are obtained when a silver halide emulsion containing up to 20 mol % of AgI is prepared by the precipitation of a silver halide emulsion A containing up to 100 mol % of AgI and the addition of a silver halide emulsion B which contains up to 40 mol % of AgI, has an average grain size of at most 0.25 .mu.m and is always more soluble in aqueous gelatine solution than emulsion A either due to its grain size or due to its iodide content, this being carried out in the presence of at least two compounds selected from imidazole, histidine (.alpha.-amino-.beta.

Abstract: A photographic recording material on a transparent support having at least one light-sensitive silver halide emulsion layer and optionally conventional interlayers and protective layers, characterized in that the photographic recording material contains, in at least one of the above-mentioned layers, a compound corresponding to formula I, II or III ##STR1## wherein R.sub.1 denotes an unsubstituted or substituted alkyl group, an unsubstituted or substituted aryl group or an unsubstituted or substituted heterocyclic group,R2 denotes hydrogen, an unsubstituted or substituted alkyl group, an unsubstituted or substituted aryl group or an unsubstituted or substituted alkylthio group,R.sub.

Abstract: A color photographic recording material containing, on a layer support, at least one blue sensitive silver halide emulsion layer and a yellow coupler associated therewith, at least one green sensitive silver halide emulsion layer and a magenta coupler associated therewith and at least one red sensitive silver halide emulsion layer and a cyan coupler associated therewith also contains, in a layer which is not sensitive to light, a compound corresponding to formula I (stabilizer) ##STR1## wherein R.sup.1 denotes H or a group which can be split off under alkaline development conditions;R.sup.2 denotes H, halogen, OH, an alkyl having 1 to 4 carbon atoms, an alkoxy having 1 to 4 carbon atoms, COOR.sup.3, CONR.sup.4 R.sup.5, SO.sub.2 NR.sup.4 R.sup.5, NH--COR.sup.3, NH--SO.sub.2 --R.sup.3 or NH--CO--NHR.sup.4 ;R.sup.3 denotes an alkyl having 1 to 4 carbon atoms,R.sup.4 and R.sup.5 denote H or a group such as R.sup.

Abstract: Light sensitive color photographic silver halide material containing at least one light sensitive silver halide layer with which a conventional diffusion fast color coupler is associated and optionally other layers, both light sensitive and light insensitive, in which material the one or more than one light sensitive silver halide layer contains, at a concentration of 10.sup.-3 to 10 mmol/mol of silver halide, a compound corresponding to the following formulaA(Z).sub.n K (I)absorbed on and adhering to the silver halide grain and reacting with the developer oxidation product (EOP) with an effective reaction rate constant of K.sub.eff .gtoreq.10.sup.3, in which formulaA is a grain active bonding group,Z denotes a divalent intermediate membern is 0 or 1 andK denotes a group which forms a colored or uncolored reaction product in the reaction with the developer oxidation product,is found to have an improved sensitivity/graininess ratio.

Abstract: A photosensitive silver halide material comprising a support and at least one photosensitive silver halide emulsion layer, of which the emulsion contains an effective quantity of at least one compound from each of at least two classes A, B, C and D defined hereinafter:A) compounds corresponding to general formula I ##STR1## B) compounds corresponding to general formula II ##STR2## or tautomers thereof, C) compounds corresponding to general formula (III) ##STR3## D) compounds corresponding to general formula IV ##STR4## in which R.sub.1 -R.sub.3, R.sub.11 -R.sub.19, Y, Z, m and n are as defined in the specification,are distinguished by effective latent image stabilization for a minimum increase in fogging and loss of sensitivity.

Abstract: The invention relates to a photographic recording material comprising a layer support and, arranged thereon, at least one photosensitive silver halide emulsion layer which contains an antifogging agent corresponding to formula (I) ##STR1## in which A, R.sub.1 and R.sub.2 are as defined in the specification. The antifogging agents according to the invention reduce fogging without significantly affecting gradation and improve the staility of the photographic material in storage.

Abstract: A silver image produced by imagewise exposure, development and fixing of a photographic material containing at least one silver halide emulsion layer is stabilized by being subjected after fixing to treatment by a stabilizing bath containing a compound corresponding to general formula IR.sub.1 --(NHCO--R.sub.2 --R.sub.3).sub.m (I)in whichR.sub.1 represents a nitrogen-containing 5- or 6-membered heterocycle,R.sub.2 represents an optionally branched C.sub.1-8 alkylene radical,R.sub.3 represents Cl or Br andm=1 or 2.

Abstract: A color photographic silver halide material of the negative type, in which at least one silver halide emulsion layer contains as compound corresponding to the following formulaA--(Z).sub.n --F* (I)adsorbed on the silver halide grain,A being a grain-active attachment group corresponding to formulae IIa to IId: ##STR1## Z is a difunctional intermediate member, F* is a latent fogging agent group which becomes the active fogging agent (F) during color development andn=0 or 1,is distinguished by improved sensitivity.

Abstract: Improved photographic recording materials contain silver halide grains having at least two zones differing in their halide composition and, as stabilizer, a compound corresponding to the formula ##STR1##

Abstract: Water soluble sulphates of a heteroaromatic bis- or poly-sulphone are suitable for use as hardeners for proteinaceous binders, in particular in photographic layers.

Abstract: Photographically produced black and white images (silver images) are stabilized against subsequent destruction of the image silver, in particular due to discoloration, by treating the finished silver image with an aqueous after treatment bath containing aminotetrazole or a mercaptotetrahydrotriazine.

Abstract: Process for the production of color images by the color photographic dye diffusion process in which development is brought about by heat and water. The combination of antifoggants added to the light-sensitive material, in particular the combination of compounds of formulae I and II, produces a marked improvement in storage stability and constancy of sensitivity with good D.sub.min /D.sub.max ratios. ##STR1## R.sup.1 denotes hydrogen, alkyl with up to 6 carbon atoms, hydroxy, halogen, alkoxy or substituents which together form a condensed benzene ring, and in formula II below: ##STR2## R.sup.2 denotes a group which can be split off in the process of development of the material andR.sup.3 denotes hydrogen, halogen, alkyl with up to 4 carbon atoms, alkoxy, carboxy, carbalkoxy, carbonamido or sulphonamido.

Abstract: Remarkably high interimage and Eberhard effects are obtained when yellow DIR couplers corresponding to formuls I are added to multilayered color photographic recording materials, in particular to the green-sensitive or red-sensitive layers. These couplers can improve the sharpness and color reproduction. ##STR1## R.sup.1 denoted alkyl or aryl, R.sup.2 denotes alkyl with up to 18 carbon atoms,R.sup.3 denotes halogen, SO.sub.2 --R.sup.6, SO.sub.2 --NR.sup.7 --R.sup.8 or NH--SO.sub.2 --R.sup.6,R.sup.4 denoted H, alkyl or aryl.R.sup.5 denotes alkyl, cycloalkyl, alkinyl, aralkyl or aryl,R.sup.6 denotes alkyl or aryl,R.sup.7 denotes H or alkyl andR.sup.8 denoted H, alkyl, aryl, CO--R.sup.6 or ##STR2## and the total number of carbon atoms in R.sup.4 and R.sup.5 is not greater than 11.

Abstract: Photographically produced black-and-white images (silver images) are stabilized against subsequent destruction of the silver image, in particular against the occurrence of so-called microspot defects, by treatment of the finished silver image with an aqueous after-treatment bath containing an amino-1,2,4-triazole.

Abstract: A color photographic recording material developable by heat treatment and comprising at least one binder layer, which contains photosensitive silver halide, optionally a substantially non-photosensitive silver salt and a color providing compound (dye releaser), can be improved in regard to the Dmin/max relation and in regard to sensitivity by addition of a compound corresponding to formula IR.sup.1 --S--CO--O--R.sup.2in which R.sup.1 and R.sup.2 independently of one another represent alkyl, alkenyl, cycloalkyl, aralkyl or aryl.

Abstract: For electronic image recording in one or more colors a photographic recording material comprising in at least one layer photo-sensitive silver halide and a compound capable of luminescence is image-wise exposed and developed to produce a latent luminescence image. The image information contained in the latent luminescence image is scanned photoselectively by a luminescence spectroscopic process and is recoded electronically in the form of monochromatic luminescence signals. The process provides images in one or more colors and is highly sensitive. Recording materials of extremely low silver application can be used.

Abstract: A dye preparation consists of a water-soluble acid dye and a water-insoluble basic carrier. The carrier consists of crosslinked polymer particles of average particle diameter of less than 1 .mu.m and contains at least 2 mVal/g of quaternary ammonium or phosphonium groups. The dye reacts with the carrier in an ion exchange reaction and forms a dye polymer latex which can easily isolated in solid form, stored indefinitely and redispersed in water whenever required. It forms a so-called self-dispersing dye preparation. The dye preparation is useful for making dyed layers such as in photographic recording materials.

Abstract: Color photographic images are produced by decomposing hydrogen peroxide on nuclei present in imagewise distribution and bleaching out a dye by the hydrogen peroxide on those parts of the image where no such nuclei are present.

Abstract: Addition polymers containing at least 10 mole % of recurring structural units of formula I are useful mordants for acid dyes which preferably contain at least two sulfo groups. The polymers can be used together with the dyes in dyed layers of photographic recording materials, such as in antihalo or filter layers. ##STR1## in which Q represents N or P;R.sup.1, R.sup.2, R.sup.3 represent alkyl or carbocyclic radicals or two of R.sup.1, R.sup.2 and R.sup.3 complete a 5- or 6-membered heterocyclic ring,R.sup.4 represents H or alkyl,X.sup..crclbar. represents an anion.