Abstract: Photographic elements and emulsions are described which are capable of providing high contrast images. The elements and emulsions comprise negative working silver halide and contrast enhancing arylhydrazide nucleating agents. A process for utilization of the elements and emulsions is also described.

Abstract: Compounds and reagents containing the compounds are disclosed for detecting oxidase positive organisms. The compounds have the structureCOUP--LINK).sub.n RwhereinCOUP-- represents a radical that couples with an oxidized primary aromatic amine and releases --LINK--R;--LINK-- represents a divalent radical that undergoes intramolecular cyclization and release of --R upon release by COUP--;n represents zero or one;--R represents a monovalent radical that forms a detectable species in the form of a colorimetric dye or fluorescent compound upon release from --LINK--; wherein --R is selected from the group consisting of: ##STR1## wherein W represents hydrogen; halogen; hydroxy; substituted or unsubstituted carbonamido; sulfonamido; sulfonyl; ureido or amino;R.sup.1 and R.sup.2 each independently represent hydrogen, halogen, alkyl, alkoxy, carboxy, sulfo, cyano, nitro, carboxylic acid ester, carbonyl, sulfonyl, carbonamido, sulfonamido, alkylsulfonyl, arylsulfonyl; andR.sup.3 and R.sup.

Abstract: A photographic recording material and emulsion are described which are capable of providing high contrast images. The recording material and emulsion comprises negative working silver halide and contrast enhancing arylhydrazide nucleating agents. A process for utilization of the elements and emulsions is also described.

Abstract: Photographic elements, diffusion transfer assemblages and processes are described which employ a nondiffusible, redox, dye-releasing compound comprising a ballasted, sulfonamidophenol or sulfonamidonaphthol compound having a dye moiety attached thereto through the sulfonamido group of the compound, the sulfonamido group being located in a position which is conjugated with respect to the position of the hydroxy group of the compound, and wherein(a) the compound has at least one substituent thereon in a position which is conjugated with respect to the position of the sulfonamido group, the substituent being selected from the group consisting of hydroxy, sulfonamido, phosphonamido and carbonamido, and(b) the compound not having a hydroxy, alkoxy, aryloxy, sulfonamido, phosphonamido or carbonamido group thereon in a position which is conjugated with respect to the position of the hydroxy group of the compound,with the proviso that when the compound is a 2-sulfonamidophenol and has only one substituent thereon in

Abstract: A dye-releasing mechanism is described which employs a nondiffusible dye-releasing compound having a dye or dye-precursor moiety attached thereto through a sulfonamido cleavage linkage so that a diffusible sulfonamide dye or dye-precursor will be released upon oxidation and subsequent alkaline hydrolysis of the compound.

Abstract: Color photographic elements, compositions, diffusion transfer film units and processes are described which employ a nondiffusible p-sulfonamidoaniline or p-sulfonamidophenol which is preferably alkali-cleavable upon oxidation to release a diffusible color-providing moiety.

Abstract: Color photographic elements, diffusion transfer film units and processes are described which employ nondiffusible o-sulfonamidonaphthols which are alkali-cleavable upon oxidation to release a diffusible color-providing moiety.

Abstract: Nondiffusible p-sulfonamidophenols which are alkalicleavable upon oxidation to release a diffusible color-providing moiety from the benzene nucleus having the formula: ##SPC1##Wherein Col is a dye or dye precursor moiety, and Ballast is an organic ballasting radical which renders the compound nondiffusible in a photographic element during development with an alkaline processing composition.