Abstract: The invention relates to an emulsion comprising bromide grains wherein said grains are chemically sensitized with a water soluble Au(I) complex having the formula [L—Au—L]M wherein the complex is symmetrical; L is an organomercapto ligand which has antifogging, stabilizing, or sensitizing properties, and M is a cationic counter ion and a rapid sulfiding agent represented by structure SS-1: wherein each of the R1, R2, R3, and R4 groups independently represents an alkylene, cycloalkylene, carbocyclic arylene, heterocyclic arylene, alkarylene or aralkylene group; or taken together with the nitrogen atom to which they are attached, R1 and R2 or R3 and R4 can complete a 5- to 7-membered heterocyclic ring; and each of the B1, B2, B3, and B4 groups independently is hydrogen or represents a carboxylic, sulfinic, sulfonic, hydroxamic, mercapto, sulfonamido or primary or secondary amino nucleophilic group, with the proviso that at least one of the B1R1 to B4R4 groups contains

Abstract: This invention relates to a method of reducing fog in a silver halide emulsion comprising taking a high fogging emulsion which has been chemically sensitized and cooled, holding the high fogging emulsion in the form of a melt in preparation for coating on a support, and prior to or during said holding, contacting the emulsion with an isothiazolin-one compound represented by the following formula wherein R1 is a substituent; and Z contains the carbon atoms necessary to form a substituted or unsubstituted non-aromatic ring. It also relates to silver halide photographic elements containing such emulsions.

Abstract: The invention relates to the preparation of photographic dispersions. The method of the invention consists in preparing a fluid dispersion of an additive in a colloid, congealing the resulting dispersion, subdividing the resulting congealed dispersion into particles, washing the resulting particles, and adding to them a solution of biocide. A dispersion is thus obtained that is protected against the proliferation of micro-organisms during storage.

Abstract: A conditioning or bleach accelerating solution is prepared by diluting a concentrate up to 25 times. The concentrate contains a formaldehyde bisulfite precursor salt at from 200 to 600 g/l, sulfite ions at 0 to 200 g/l, a bleach accelerating agent at from 1.5 to 25 g/l, and a metal ion chelating agent present at up to 60 g/l. The concentrate is free of sodium ions.

Abstract: A new fogging photographic processing solution for a reversal process comprises a compound (I) and a bi-nucleophilic agent. Compound (I) corresponds to the following formula: ##STR1## wherein A is a group capable of being adsorbed to the silver halide surface, L is a linking group and r is 0 or 1, R.sub.1 and R.sub.2 are independently selected from an alkyl group, substituted or unsubstituted, and an aryl group substituted or unsubstituted. A process of producing a positive image by imagewise exposure of a reversal silver halide material comprises contacting the material with the above fogging solution or by imagewise exposure of such a material containing a compound (I) and contacting the material with a solution comprising a bi-nucleophilic agent.

Abstract: An object of the present invention is to provide a thermosetting resin composition which can impart high slidability and great abrasion resistance while maintaining the excellent properties of thermosetting resins such as outstanding heat resistance, high-precision moldability, long-term durability, great mechanical strength, etc. The thermosetting resin composition for a sliding member according to the present invention comprises 100 parts by weight of a thermosetting resin, 50 to 600 parts by weight of an inorganic filler and 2 to 20 parts by weight of polyolefin powder having a particle size of up to 200 .mu.m, the inorganic filler containing potassium titanate fibers in an amount of 2 to 35 parts by weight per 100 parts by weight of the thermosetting resin.

Abstract: A conditioning or bleach accelerating solution is prepared by diluting a concentrate up to 25 times. The concentrate contains a formaldehyde bisulfite precursor salt at from 200 to 600 g/l, sulfite ions at 0 to 200 g/l, a bleach accelerating agent at from 1.5 to 25 g/l, and a metal ion chelating agent present at up to 60 g/l. The concentrate is free of sodium ions.

Abstract: An emulsification and dispersion method of a hydrophobic, photographically useful compound comprising dispersing a water-insoluble phase containing the hydrophobic, photographically useful compound in water or in a hydrophilic colloid composition, wherein the water-insoluble phase at a temperature at which the prepared dispersion is stored may have a viscosity of from 100 poise or more to less than 1,000,000 poise at the shear rate of 10 sec.sup.-1. According to the present invention, a silver halide photographic material comprising a fine dispersion of a hydrophobic, photographically useful compound and having an excellent production suitability can be obtained.

Abstract: The present invention concerns a method for developing a photographic product containing incorporated developers, and a layer of a novel activator. This method consists of applying to an exposed photographic product a thin layer of an aqueous homogeneous development activator solution which comprises (a) an alkanolamine in an amount higher or equal to 0.6 mol/l, (b) at least one stable wetting agent that is stable at a high pH and is miscible in the activator solution, and (c) a quaternary ammonium salt.

Abstract: Disclosed is a photographic processing composition in the tablet form which comprises a first and a second ingredients, said composition being prepared by a first granulating a first powder comprising said first ingredient to form first granules, a second granulating a second powder comprising said second ingredient to form second granules, mixing said first and second granules, and compressing said mixture of granules. The tables have an apparent density of 1.0 to 2.5 g/cm.sup.3.

Abstract: The invention concerns a process for coating a photographic support.The process consists of depositing on a support a succession of at least two layers, at least one of which consists of a photosensitive composition, the top layer, situated at the opposite side to the support, containing a given concentration of at least one surfactant, the process being characterized in that a surfactant present in the top layer is introduced into the layer adjacent to the top layer at a concentration equal to at least 25% of the concentration of the same surfactant in the said top layer.

Abstract: Surfactants useful as dispersing aids in the preparation of compositions comprising a hydrophilic colloid having hydrophobic particles dispersed therein have the structure ##STR1## wherein M is a cation;X represents a group having the structure ##STR2## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 independently represents hydrogen or alkyl; or R.sup.1 and R.sup.2 taken together represent cycloalkyl; or R.sup.3 and R.sup.4 taken together represent cycloalkyl; and,n represents 0 or 1;provided that the total number of carbon atoms in each X group is 3 or 4, and when R.sup.1 is hydrogen R.sup.2 is other than methyl. Such surfactants offer coating and photographic property advantages when incorporated in multilayer photographic materials comprising a support bearing a plurality of hydrophilic colloid layers.

Abstract: A method is described for preparing a concentrated dispersion of a photographically useful compound ready-for-use in coating solutions of hydrophilic colloid layers of a silver halide photographic material, wherein said compound has at least one ionisable acid site on its molecule, the said method comprising the steps of deprotonising and solubilising the said compound in alkaline medium; microprecipitating the said compound and milling the microprecipitated compound obtained, coating the said dispersion of a photographically useful compound in non-light-sensitive and/or light-sensitive hydrophilic layers of a silver halide photographic material, wherein milling proceeds during and/or after the microprecipitating step.

Abstract: Solid particle dispersions of compounds useful in imaging elements can be made with substantially improved stability to particle growth by dispersing the compound of interest in the presence of a relatively small amount of a second compound that is structurally similar to the compound of interest. This second compound is combined with the compound of interest prior to dispersing the compound 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. While being distinct, the second compound has a similar chemical structure to the main compound.

Abstract: A process for buffering concentrated aqueous slurries comprising the steps of:providing a particulate solid substance comprising a weak acid functional group, having effective pK.sub.a1 >1 and less than 1% by weight aqueous solubility at pH=pK.sub.a1 ;providing an aqueous solution consisting essentially of water or a mixture of water with water-miscible solvent, at pH less than the greater of 7 and pK.sub.a1 +2;providing a buffering salt of a weak acid, where the weak acid associated with this buffering salt has pK.sub.a2 and wherepK.sub.a1 -2.ltoreq.pK.sub.a2 ; andcombining said aqueous solution, said particulate solid substance, and said buffering salt to form a slurry;wherein said process is essentially devoid of any step comprising the addition of any weak acid, other than that arising from reaction between said buffering salt and said particulate solid substance, having greater than 2% by weight aqueous solubility at pH=pK.sub.a1 is disclosed.

Abstract: There is disclosed a method of manufacturing a photographic polyester film, comprising forming an unstretched film controlling; each of the temperature of the inlet of a melt extruder, at a temperature in the range from "the melting point of the polymer (Tm)"-10.degree. C. to the Tm+15.degree. C.; the temperature of the central part of a screw, at a temperature in the range from the Tm to the Tm+30.degree. C.; and the temperature of the outlet thereof, at a temperature in the range from the Tm+10.degree. C. to the Tm+35.degree. C., followed by biaxial stretching and heat-setting, and a photographic support manufactured by the method. The thus obtained photographic polyester support excels in photographic properties, adhesiveness, and mechanical strength, and that moreover hardly causes a core set curl and fog formation.

Abstract: Stable photographic coating compositions comprising a polymer latex are prepared by mixing an aqueous solution comprising gelatin with a latex dispersion of a polymer of the formula(A).sub.x (B).sub.y (C).sub.zwhereA and B are formed from nonionic monomers,C is formed from anionic monomers, andx, y and z are monomer weight fractions where x=0 to 1.0, y=0 to 1.0, x+y=about 0.98 to 1.0, and z=0 to about 0.02,wherein A, B, x and y are such that latex dispersions of polymers of the formula (A).sub.x (B).sub.y have calcium ion critical coagulation concentrations of less than 80 mM Ca.sup.+2 in gelatin solutions,wherein the gelatin of the aqueous solution mixed with the latex dispersion comprises a gelatin of low calcium ion content such that the coating composition has a calcium Ca.sup.2+ concentration of less than 2 mM. The method of the invention allows for the preparation of aqueous gelatin coating solutions comprising latex dispersions of polymers which are unstable in the presence of calcium ions.

Abstract: An image forming method is disclosed, comprising exposing a silver halide photographic material through a transparent, high definition-screening original and developing the photographic material with a developer to form a halftone dot image, wherein:the photographic material forms a halftone dot image having a dot area of 57% or less when exposed, through the transparent original comprising a halftone dot image having a dot area of 50%, in two times an amount that gives a halftone dot having a dot area of 50%; and the photographic material has a maximum density of 3.0 or more and a contrast of 8.0 or more;and wherein the photographic material is exposed to light having an emission peak at a wavelength of 360 to 450 nm and developed with a developer having a pH of 10.5 or less.

Abstract: A process for dispersing a particulate solid substance in a continuos aqueous phase comprising the steps of:providing a comminution reactor;providing a particulate solid substance comprising a weak acid functional group, having effective pK.sub.a1 >1 and less than 1% by weight aqueous solubility at pH=pK.sub.a1 ;providing an aqueous solution consisting essentially of water or a mixture of water with water-miscible solvent, at pH less than the greater of 7 and pK.sub.a1 +2;providing a buffering salt of a weak acid, where the weak acid associated with this buffering salt has pK.sub.a2 and wherepK.sub.a1 -2.ltoreq.pK.sub.a2 ;providing milling media;combining said particulate solid substance, said aqueous solution, said buffering salt, and said milling media in said comminution reactor to produce a multiphase mixture; andmilling said mixture to produce a reduced particle size slurry of said particulate solid substance is disclosed.

Abstract: This invention provides composition and method to overcome the very high viscosity of prior small-particle dispersions when admixed with gelatin in aqueous solution for coating a photographic film element.The invention is generally accomplished by the utilization of a second surfactant in the melt formulated by the admixture of the small-particle dispersion and the gelatin solution. The surfactants of this invention, that is, utilized to control the rheology of such said melts, have the following general structure: ##STR1## wherein n=5 to 20 andx=1 to 4.

Abstract: A process for making a direct dispersion of a photographically useful material is disclosed comprising subjecting a mixture of an aqueous gelatin solution, a liquid organic phase comprising a photographically useful material, and an ionic polymer to conditions of high shear or turbulence to form a fine dispersion of the organic phase having an average particle size of less than 0.5 micron dispersed in the aqueous solution; wherein the ratio of the organic phase viscosity to the aqueous gelatin solution viscosity in the absence of the ionic polymer, measured at the temperature of the dispersion forming step, is greater than a value of 2.0, and the ionic polymer is a water soluble or dispersible substantially non-surface active polyelectrolyte which has a molecular weight of at least 10,000 selected from: i) synthetic polymers derived from at least 5 mole % of monomers which contain --OSO.sub.3 M, --SO.sub.3 M, --COOM, or ---OPO(OM).sub.

Abstract: The invention relates to a method of forming a photographic paper comprising applying to a base paper a polyvinyl alcohol solution of low molecular weight, said solution containing said polyvinyl alcohol in an amount of greater than 15 percent by weight.

Abstract: The invention creates a selective oxygen barrier around individual coupler or other photographically active particles by surrounding each particle with a layer of water applicable oxygen barrier polymer such as polyvinyl alcohol (PVA), which will also act as a steric barrier to coalescence of the particles. Photographic products formed with such materials are more dye stable. The dispersions of this invention are prepared by mechanical milling or homogenization procedures.

Abstract: A method of manufacturing a tablet processing agent for a silver halide photographic light-sensitive material is disclosed, which comprises the step ofmolding particles into tablets at a compression pressure of 400 to 4500 kg/cm.sup.2 and at a compression dwell time of 0.015 to 1.000 second to obtain the tablet processing agent, wherein the particles comprises a compound selected from the group consisting of a p-phenylene diamine and its derivatives, a hydroxylamine and its derivatives, an alkali metal carbonate, an amino polycarboxylic acid ferric complex and a thiosulfate.

Abstract: A method of preparing submicron particles of a material, such as a pigment useful in paints or a compound useful in imaging elements, which comprises milling the agent in the presence of milling media having a mean particle size of less than about 100 microns. In a preferred embodiment, the milling media is a polymeric resin. The method provides extremely fine particles, e.g., less than 100 nm in size, free of unacceptable contamination.

Abstract: Surfactants useful as dispersing aids in the preparation of compositions comprising a hydrophilic colloid having hydrophobic particles dispersed therein have the structure ##STR1## wherein R is H or methyl provided that when each n=1, each R is methyl;M is a cation; and,n is an integer from 1 to 6.Such surfactants offer coating, photographic property and processing advantages when incorporated in photographic materials comprising a support bearing a plurality of hydrophilic colloid layers including at least one light-sensitive silver halide emulsion layer wherein at least one of the underlying hydrophilic colloid layers of the material contains hydrophobic particles dispersed therein with the aid of the surfactant.

Abstract: Particles of compound useful in imaging elements are milled using a milling media comprising a polymeric resin. The use of polymeric milling media permits the production of particles having an average particle size less than 1 micron. Further, the resulting particles are free from the contamination resulting from conventional milling media of, for example, glass, ceramic or steel.

Abstract: The invention provides a novel and economic method for the production of an activated propene from a malonitrile dimer which comprises reacting a compound of the formula (I) ##STR1## with a nucleophile D to provide a compound of the formula (II) ##STR2## wherein substituents A, B and E each individually represent hydrogen, a substituted or unsubstituted alkyl acyl carboxyl or aryl group or an electron withdrawing group, and X is a group capable of displacement via a substitution reaction.

Abstract: Color photographic materials comprise a support bearing a silver halide emulsion and at least one water-dispersible polymeric coupler. The polymeric coupler is formed by polymerization of a mixture of at least one ethylenically unsaturated coupler monomer containing a dye-forming coupler moiety and at least one ionic monomer containing an ionizable functional group, in a water-miscible organic solvent. The polymeric coupler contains less than 10 weight percent of the ionic monomer.

Abstract: A two-phase acidic aqueous composition for use as a neutralization layer is generally comprised of a water soluble aqueous phase and a water insoluble particle phase. The particle phase generally comprises a copolymer having recurring units of an organic acid monomer and an organic ester monomer. The aqueous phase comprises a water soluble polymer having recurring units of at least an organic acid monomer. The organic acid monomers selected for the aqueous phase polymer are capable of interacting with the particle phase polymers such that the particle phase polymers are brought into stabilizing, intimate association with the aqueous phase.

Abstract: The tendency of a photographically useful compound (PUC) to crystallize when dispersed in an aqueous medium is inhibited by codispersing with the PUC a non-color forming, oil-soluble, monomeric or oligomeric organic compound having a glass transition temperature between 0.degree. and 150.degree. C. Preferred organic compounds are oil-soluble sucrose esters, such as sucrose octaacetate, and rosin and derivatives thereof.

Abstract: Process for forming a microcrystalline coupler dispersion comprising the steps of: providing crystalline coupler in an aqueous suspension; dispersing said coupler with mechanical shear, combining said coupler dispersion with an activating water-immiscible organic solvent; and mixing said combined dispersion is disclosed.

Abstract: Photographic coupler compositions comprise a magenta dye-forming coupler and an alcohol in an amount sufficient to increase the activity of the dye-forming coupler. The alcohol is of the formula ##STR1## wherein R.sub.1 is selected from the group consisting of (a) unsubstituted alkyl and alkenyl groups, (b) alkyl groups containing one or more substitutents selected from the group consisting of aryl groups, alkenyl groups, halogen atoms, alkoxy groups, alkoxy carbonyl groups and acyloxy groups, (c) unsubstituted aryl groups and (d) aryl groups containing one or more substituents selected from the group consisting of alkyl groups, alkoxy groups, alkoxy carbonyl groups and acyloxy groups; and R.sub.2 and R.sub.3 are individually selected from hydrogen and the group of moieties from which R is selected, provided that the total number of carbon atoms contained in R.sub.1, R.sub.2 and R.sub.3 is at least 10.

Abstract: A two-phase acidic aqueous composition for use as a neutralization layer is generally comprised of a water soluble aqueous phase and a water insoluble particle phase. The particle phase generally comprises a copolymer having recurring units of an organic acid monomer and an organic ester monomer. The aqueous phase comprises a water soluble polymer having recurring units of at least an organic acid monomer. The organic acid monomers selected for the aqueous phase polymer are capable of interacting with the particle phase polymers such that the particle phase polymers are brought into stabilizing, intimate association with the aqueous phase.

Abstract: A solid processing agent for a silver halide photographic light-sensitive material is disclosed, which comprises a compound represented by the following Formula (I): ##STR1## wherein R.sub.1 represents a halogen atom, an alkyl group or an alkenyl group, provided that a plural of R.sub.1 's may be the same or different; R.sub.2 represents a halogen atom, an alkyl group, an alkenyl group or an alkoxy group; R.sub.3 represents a lower alkyl group, provided that R.sub.1, R.sub.2 and R.sub.3 may be the same or different, m and n each represent an integer of 0 to 5; and X represents an anion.

Abstract: The invention provides a photographic dispersion for inducing dye stability in the eventual photographic product. The invention provides in a first aspect a photographic dispersion comprising a photographic coupler and a solvent therefore wherein the solvent is solid at its temperature of fade concern thereby to promote dye stability in use.The invention also provides a photographic coupler and a solvent therefor wherein the solvent is an alkyl alcohol or an optionally substituted dialkyl or diaryl phosphate. The coupler may have a ballasted chain having a matched molecular structure thereby to further promote dye stability in use.

Abstract: The invention discloses a continuous method of manufacture of gelled dispersion melts of "small-particle" microprecipitated photographic agents. The continuous melt manufacturing process of this invention provides dispersion melts that are invariant in agent concentration, melt viscosity, and turbidity as a function of the run time and are also very reproducible and robust in repetitive preparations. Many photographic melts of this invention exhibit high photographic activity and light stability of the agents when exposed to light.

Abstract: Fine particle photographic coupler dispersions are prepared by forming a dispersion of a photographic coupler, coupler solvent and auxiliary coupler solvent in an aqueous gelatin medium containing at least about 1% by weight of an anionic surfactant selected from the group consisting of alkali metal salts of alkarylene sulfonic acids, alkali metal salts of alkyl sulfates, alkaryl sulfonate salts, and alkyl sulfosuccinates; and washing the dispersion with water for a time sufficient to remove at least one-fourth of the surfactant.

Abstract: A processing chemical for light-sensitive silver halide photographic material, comprising a cyclodextrin compound, which can contribute a decrease in packaging materials, transportation cost and storage space, can be free from lateral cracking at the formation of tablets, and can bring about an improvement in storage stability after being formed into processing solutions (i.e., more free from occurrence of stain during developing and scratches in light-sensitive materials having been processed, caused by deposition of crystals).

Abstract: This invention provides composition and method to overcome the very high viscosity of prior small-particle dispersions when admixed with gelatin in aqueous solution for coating a photographic film element.The invention is generally accomplished by the utilization of a second surfactant in the melt formulated by the admixture of the small-particle dispersion and the gelatin solution. The surfactants of this invention, that is, utilized to control the theology of such said melts, have the following general structure: ##STR1## wherein n=5 to 20 andx=1 to 4.

Abstract: The invention involves a bleachable antihalation system, particularly for use in thermally developable photographic recording materials. This antihalation system contains, besides an antihalation dye, a bleaching agent that forms sulfurous acid or sulfurous acid derivatives on treatment with heat or irradiation with actinic radiation.

Abstract: A dispersion of a photographic additive in a hydrophilic colloid having improved stability against the formation of crystals by incorporated into the oil phase of the dispersion prior to mixing, less than 2 percent by weight, based on the weight of the oil phase, of a compound having the formula ##STR1## wherein R, R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are independently selected from alkyl including linear, branched or in substituted alkyl having from 1 to 25 carbon atoms, the substituents being aryl, halo, cyano; aryl, including substituted aryl, the substituents being alkyl or halo; wherein addition to the above, R may also be a siloxane or polysiloxane to give a branched molecule; and in addition to the above, R.sub.3 and R.sub.4 may also be alkoxy and m and n have values from 0 to 5000.

Abstract: Non-ionic surface active compounds are provided having the formula ##STR1## wherein L is ##STR2## L' is a chemical bond, --O--, --S--, --NH--, --CONH-- or --SO.sub.2 NH--; R is a hydrophobic substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, or a substituted or unsubstituted aryl group;each of R.sup.1 and R.sup.2 independently is hydrogen or an alkyl group having from 1 to 4 carbon atoms;each of a and b independently is 0 or an integer from 1 to 3, provided that the sum of a and b is not greater than 3; and,each of x and y independently is an integer from 3 to 7.They may be used as coating aids or dispersing aids in the preparation of photographic materials.

Abstract: This invention describes a process of coprecipitating a photographic material such as a dye-forming coupler inside a base ionizable polymeric particle. Preparation of such a dispersion is performed by providing a first flow comprising a solution of a surfactant in water containing a polymer ionizable by base, providing a second flow comprising a water miscible solvent, base, water, and the photographic material, then mixing the said first and said second flow and immediately neutralizing the mixed flow to precipitate the photographic material inside the polymer particles forming a fine particle colloidal dispersion of the photographic material. The polymer dispersions of the invention are characterized by high photographic activity and high dye-stability in some cases.

Abstract: Disclosed is a stabilizing solution for a light-sensitive silver halide color photographic material, comprises a compound represented by the following Formula I, and has a surface tension of from 15 to 60 dyne/cm at 20.degree. C.; ##STR1## wherein Z represents a group of atoms necessary to form a substituted or unsubstituted cyclic hydrocarbon or heterocyclic ring, X represents an aldehyde group, ##STR2## wherein R.sub.1 and R.sub.2 each represent a lower alkyl group. The stabilizing solution and the processing method for a light-sensitive silver halide color photographic material according to this invention, can provide a processing technique that can achieve a superior stability of dye images, can better prevent backside deposits, can promise superior solution stability, and can better prevent yellow staining.

Abstract: A developer for light-sensitive material capable of processing in common a negative-working light-sensitive lithographic printing plate and a positive-working light-sensitive printing plate as well as a developing agent-containing type silver halide photographic material, is disclosed. The developer comprises an alkali agent, an anionic surface active agent, an antifoggant for a silver halide photographic material, and an alkylene oxide addition product (molecular weight of from 130 to 1200) of an aromatic amine or an aralkyl amine, and has pH of the range of from 11.5 to 13.5.

Abstract: Solid anti-fogging agents such as 5-nitroindazole which are otherwise poorly soluble in water are converted to readily water soluble compositions that are solids at room temperature when they are first dissolved in water soluble polymers or other organic compounds that have a melting point above room temperature and do not chemically react with the anti-fogging agent. The anti-foggants are preferably dissolved in the polymer or organic compound at or near the compounds' melting point below 175.degree.C.

Abstract: A magenta dye-forming pyrazolotriazole coupler solubilized by one or two sulfonamido groups results in a coupler having increased coupling activity, low fog and good dispersability. The couplers are useful in photographic elements and react with oxidized silver halide to form dyes, and/or to release photographically useful groups.

Abstract: The invention provides stable dispersions of couplers and methods of their formation. The stable dispersions are formed by the use of a nonionic water soluble polymer in combination with an anionic surfactant having a sulfate or sulfonate head group and a hydrophobic group of 8 to 20 carbons. The preferred nonionic water soluble polymers are polyethyleneoxide and polyvinylpyrrolidene. It is preferred that the dispersions have a pH of between about 5 and 5.5.

Abstract: A novel class of bridged indicator dyes is disclosed which possess absorption in the infrared region of the electromagnetic spectrum. These bridged indicator dyes are useful as light-absorbing, pH-sensitive optical filter agents in diffusion transfer photographic processes adapted to be performed in the presence of ambient light and to diffusion transfer products useful in such processes. These indicator dyes will also find utility in titrations and other analytical techniques and products where pH-sensitive indicator dyes are employed and absorption of infrared is useful.