Abstract: Photographic silver halide material developed in the presence of a novel antifogging or stabilizing compound which is present in the material and/or in the developing composition and corresponds to the following formula: ##STR1## wherein: Q is sulphur or seleniumX is sulphur, selenium or oxygenY is sulphur, selenium, oxygen or a single bond,R.sup.1 stands for an alkyl group having no nitrogen containing substituents or an aryl group,R.sup.2 represents the same groups as indicated for R.sup.1, provided that only when X represents sulphur or selenium nitrogen containing substituents of alkyl are excluded,R.sup.3 stands for hydrogen, carboxy in acid or salt form, an alkyl group or an aryl group, andR.sup.4 stands for hydrogen provided Y represents a single bond, an alkyl group having no nitrogen containing substituents, when Y represents sulphur or selenium and having no hydroxy substituents when Y represents a single bond and X as well as Q represent sulphur or selenium, or an aryl group,R.sup.3 and R.sup.

Abstract: In the preparation of silver halide emulsions silver halide grain-growth is accelerated by the addition to the precipitation medium during or before silver halide precipitation of a compound of the formula ##STR1## wherein: N IS AN INTEGER FROM 1 TO 5R.sup.1 is C.sub.1 -C.sub.5 alkyl or substituted alkylR.sup.2 is hydrogen or C.sub.1 -C.sub.5 alkyl or substituted alkyl, or a carboxylic acyl groupR.sup.3 is hydrogen or C.sub.1 -C.sub.5 alkyl or substituted alkyl, andR.sup.4 is hydrogen or C.sub.1 -C.sub.5 alkyl or substituted alkyl group, aryl or substituted aryl or a salt-forming cation.

Abstract: A recording process including image stabilization comprising the steps of:1. image-wise exposing to active electromagnetic radiation of a recording material containing in a recording layer a dye precursor compound and at least one photosensitive organic polyhalogen compound capable of producing photoradicals and a dyestuff with said dye precursor compound when exposed with ultraviolet radiation and/or visible light, and2. heating the photoexposed recording material thereby transforming the non-decomposed polyhalogen compound into a non-photosensitive substance by reaction with at least one stabilizing substance selected from the group consisting of triphenylamine,A soft base containing an element of the group consisting of phosphorus, arsenic, antimony, bismuth, selenium, and tellurium, and an .alpha.,.beta.-ethylenically unsaturated compound in which at least the .alpha.

Abstract: A method is described of developing a photographic silver halide element containing developable silver halide by means of a silver halide developing composition, comprising as development activator a derivative of a polyethylene glycol or a C.sub.1 -C.sub.5 monoalkyl ether thereof corresponding to the formula:R.sub.1 O(CH.sub.2 CH.sub.2 O).sub.n X--A--Y--R.sub.2whereinR.sub.1 is hydrogen, C.sub.1 -C.sub.5 alkyl or the group X--A--Y--R.sub.2n is an integer of at least 4X is CO, SO.sub.2, CONH or, when R.sub.1 is X--A--Y--R.sub.2 may be a chemical monovalent bond,A is alkylene or arylene,Y is a sulphur or selenium atom, andR.sub.2 is an alkyl group.

Abstract: A method of developing an exposed lith-type silver halide emulsion is described wherein development takes place in the presence of a sulphonium compound corresponding to the formula: ##STR1## wherein: EACH OF X.sub.1 and X.sub.2 represents an alkyl group at least one of which carries a hydroxy, carboxy, sulpho or cyano group,R represents an alkyl group, an aryl group or the group ##STR2## wherein A is a divalent organic group, or R may represent hydrogen when both X.sub.1 and X.sub.2 are hydroxyalkyl,n is an integer of at least 1 when the compound is a disulphonium compound and is an integer of at least 2 when the compound is a monosulphonium compound, andZ is an anion but does not exist when one of X.sub.1 and X.sub.2 itself contains an anionic group.

Abstract: Direct-positive emulsions are described comprising incorporated developing agents wherein the developing agents are 1,4-dihydroxybenzene compounds of which at least one of the hydroxyl groups has been esterified to form a hydrolyzable aliphatic acyloxy group comprising a quaternary ammonium group.

Abstract: Proteinaceous materials, especially gelatin, are hardened by incorporating therein at least one bis-epoxy compound corresponding to one of the formula: ##STR1## wherein: X represents a 1,4-piperazinylene group or a monomethyl or dimethyl-substituted 1,4-piperazinylene group, or represents a 1,2-pyrazolidinylene group,And n is 0 or an integer from 1 to 4.The proteinaceous material, especially the gelatin, is subsequently applied to form a photographic silver halide emulsion layer, a backing layer, a protective layer, a filter layer or any other photographic auxiliary layer.

Abstract: Polyoxyethylene compounds carrying thioether groups as substituents on the linear chain are described for accelerating or activating development of exposed silver halide elements.

Abstract: A method is described for developing silver halide emulsions wherein development is activated by incorporating in the developing composition or the emulsion a homopolymer or copolymer comprising (meth)acrylate or (meth)acrylamide units in which the ester linked or amide linked group contains at least one thioether sulphur atom.

Abstract: Photographic silver halide materials are described which comprise as antifogging agent a compound of the formula: ##SPC1##Wherein:X is a hydroxy or carboxy group or a substituent or fused-on azole heterocyclen is 1 to 4, andR is hydrogen, halogen, alkyl, alkoxy, alkoxycarbonyl, sulpho, aryl, fused-on benzene or X.

Abstract: New "duplo" quinoline compounds useful as photoconductors and having the formula: ##SPC1##Wherein:Z represents the atoms necessary to close an adjacent aromatic ring,R' represents a lower alkyl radical, andX represents an alkylene group or an alkylene group interrupted by a bivalent aromatic group.

Abstract: A process is described of improving the development characteristics of photographic silver halide elements by the use of compounds corresponding to the formula:RO(CH.sub.2 CH.sub.2 O).sub.n (CO).sub.m Awherein:R represents hydrogen, C.sub.1 -C.sub.5 alkyl or (--CO).sub.m --A,n is an integer of at least 4,m is 0 or 1, andA represents, when m is O, sulphoalkyl, carboxyalkyl, or sulphoalkoxycarbonylalkyl, and when m is 1, carboxyalkyl, sulphoalkoxycarbonylalkyl, carboxyalkenyl, sulphoalkoxycarbonylalkenyl, carboxyphenyl, sulphoalkoxycarbonylphenyl or sulphophenyl,The aliphatic hydrocarbon groups having at most 4C-atoms and the carboxyl and sulpho groups being in acid or salt form. The polyethylene glycol derivatives increase developability and sensitivity of black-and-white as well as colour emulsions. They also improve lith-development of photographic "lith"-emulsions.