Abstract: This invention is directed to photographic elements having hydrophilic colloid layers containing loaded particles of from 0.02 to 0.2 micron in average diameter consisting essentially of a loadable polymer, with greater than 2 percent by weight of the polymer being derived from monomers capable of forming water soluble homopolymers. A hydrophobic photographic dye, coupler, developing agent or ultraviolet absorbing compound is loaded into and distributed through the particles. The weight ratio of the hydrophobic photographic dye, coupler, developing agent or ultraviolet absorbing compound to the loadable polymer is from about 1:4 to 3:1.

Abstract: Photographic emulsions and elements are disclosed containing composite silver halide crystals. The composite crystals are comprised of multi-faceted, radiation-receptive silver iodide crystals having a minimum mean diameter of at least 0.1 micron and silver chloride crystals forming epitaxial junctions with the silver iodide crystals. At least half of the facets of the silver iodide crystals are substantially free of epitaxial silver chloride. The silver chlorides are limited to less than 75 mole percent, based on the total silver halide forming the composite crystals.

Abstract: A photographic element containing an incorporated developing agent is disclosed which forms a photographic print having a warm image tone upon successive processing in an alkaline activator bath and a stabilizer bath. The element is comprised of a reflective nonporous support bearing a silver halide emulsion layer which forms a viewable silver image therein upon processing. The emulsion layer contains an azaindene antifoggant. The element additionally contains in or adjacent the emulsion layer a warm image tone providing mixture of a quaternary ammonium salt and a silver salt of a heterocyclic mercaptan.

Abstract: Positive color diffusion transfer images are produced by a process that employs light-sensitive photographic elements containing dye-releasing redox agents. The dye-releasing redox agents may be a sulfonamido compound or a hydroquinone derivative which are capable of cleaving to release a diffusible color-providing moiety. A preferred process involves the use of black-and-white developer compositions and comprises1. developing only a negative silver image in the imagewise exposed areas of the photographic element;2. fogging the residual silver halide;3. developing the residual silver halide in the fogged element to silver and concurrently releasing a diffusible dye or dye precurser in the non-image, fogged silver halide areas; and4. at least a portion of the diffusible dye or dye precurser compound diffusing to a dye image-receiving layer.

Abstract: Novel o-nitro-substituted arylidene dyes are provided in which the o-nitro aryl group of the arylidene dye is joined through a methine chain linkage to a basic heterocyclic radical containing an electron donating atom. These dyes are photobleachable. The photobleachable properties are useful to provide light-sensitive elements in which images can be formed in or on a support by exposure to light to which the dye is sensitive and to provide photobleachable halation protection in photographic elements having coated thereon a photographic imaging layer. The o-nitro-substituted arylidene dyes can be used for antihalation purposes in photothermographic elements. The dyes can be incorporated within silver halide emulsions to reduce internal light scattering (i.e., internal halation) or to desensitize the emulsion. The dyes are also useful in filter layers.

Abstract: Novel o-nitro-substituted arylidene dyes are provided in which the o-nitro aryl group of the arylidene dye is joined through a methine chain linkage to a basic heterocyclic radical containing an electron donating atom. These dyes are photobleachable. The photobleachable properties are useful to provide light-sensitive elements in which images can be formed in or on a support by exposure to light to which the dye is sensitive and to provide photobleachable halation protection in photographic elements having coated thereon a photographic imaging layer. The o-nitro-substituted arylidene dyes can be used for antihalation purposes in photothermographic elements. The dyes can be incorporated within silver halide emulsions to reduce internal light scattering (i.e., internal halation) or to desensitize the emulsion. The dyes are also useful in filter layers.

Abstract: Tanning (hardening) agents in a colloid layer of gelatin or the like are inactive at ordinary temperatures but are activated at temperatures above 70.degree.C. to rapidly tan the colloid in which they are incorporated. Suggested uses are in thermography and photography. Specific examples describe various gelatin layers containing the heat-activated hardeners. The class of useful tanning agents is described by the formula ##SPC1##Wherein the substituents R and R' are selected from hydrogen and halogen atoms and alkyl, carboxyl, alkoxy, formyl, tertiary amino and sulfo radicals. Some specific new compounds of this class are described.

Abstract: My invention is directed to a photographic element capable of forming either a positive or a negative image, depending upon the choice of electromagnetic wavelengths to which it is exposed. The element inludes internally fogged photographic silver halide grains which are substantially free of surface fog. Associated with the grains is a desensitizer containing an imidazoquinoxaline nucleus having a reduction potential more positive than -0.90 volts and an oxidation potential more positive than +0.80 volt. The desensitizer is present in an amount of no more than that required to cover 25 percent of the silver halide grain surfaces. Also associated with the grains is a spectral sensitizing dye having an absorption peak at least 20 nm removed from any absorption peak exhibited by the desensitizer.