Abstract: The process for the development of color photographic images with an aqueous alkaline color developer mixture comprising methyl-p-dialkylaminoaniline derivates. The process provides brilliant color photographic images avoiding coloration of the support and color fog even when processing at high temperatures.

Abstract: Traces of free inhibitors for the development of silver halide which might be present as impurities of inhibitor releasing compounds or which might be prematurely released therefrom because of insufficient stability thereof during storage of the photographic material are scavenged by compounds which are capable of binding free inhibitors at pH values below 7 but to a much less extent at pH values higher than 9.

Abstract: In a color photographic material wherein by color development there are produced either non-diffusing image dyes or diffusing image dyes (the latter being transferred to an image-receiving layer) the color development is controlled by means of non-diffusing thioether compounds which on color development release a diffusing mercapto compound but do not themselves form a dye. The mercapto compound inhibits the development of the silver halide and the thioether compound has the formula ##STR1## R.sub.1 =hydrogen or alkyl with 1-3 carbon atoms R.sub.2 =alkyl with up to 22 carbon atoms the group --S--Y is split off during color development and forms a mercaptane, e.g. 5-mercapto-1-phenyltetrazole, which inhibits the development.

Abstract: For the production of cyan and magenta images by the dye diffusion transfer process dye-providing compounds of the formula I are suitable ##STR1## in which A=an oxydizable carrier residue containing a diffusion-preventing radical;n= 0 or 1;P=a monocyclic aromatic radical;M=hydrogen, halogen, alkyl sulfonyl, aryl sulfonyl or sulfamoyl;Q=acylamino;R.sup.1 =hydrogen or a hydrolyzable radical.

Abstract: Useful non-diffusible dye-giving compounds for the photographic dye diffusion transfer process are dye sulfonamides derived from enolamines or endiamines or tautomers thereof. The dye-giving compounds are oxidized by developer oxidation products and subsequently split under the conditions of alkaline development to release diffusible dyes. The compounds are of the following formula ##STR1## in which X is a dye moiety and R.sub.1, R.sub.2 and R.sub.3 have meanings given hereinafter.

Abstract: Non-diffusible dye-providing components which may be used in association with a silver halide emulsion layer and on development yield diffusible yellow dyes of improved light fastness are cyanalkyl aminoazo dyes of the formula ##STR1## in which A.sup.1 represents oxidizable carrier residue;D represents a heterocyclic or carbocyclic aromatic residue completing an azo dye; and1, m and n are 0 or 1 such that1+m+n=1;and r represents an integer of from 1 to 4.

Abstract: Non-diffusible thioether compounds capable of releasing, on reaction with color developer oxidation compounds, a diffusible silver halide development inhibitor without at the same time forming permanent dyes to any substantial extent are characterized by containing a group of the formula ##STR1## or its tautomeric form, wherein Z.sup.1 represents an electron attracting substituent and X represents an aliphatic, aromatic or heterocyclic group that if released together with the sulfur atom, forms a diffusible silver halide development inhibiting mercaptane.

Abstract: Non-diffusible dye-providing compounds for the dye diffusion transfer process yielding color images of wanted absorption characteristics and improved light fastness correspond to the formula(A).sub.n -P-N=N-B-(A).sub.1-nin whichA represents an oxidizable organic carrier residue which may be attached through a connecting member X and containing a group which confers diffusion resistance, from which carrier residue, either in its oxidized or in its unoxidized form, a part is split off together with the group which confers diffusion resistance under alkaline photographic development conditions, a diffusible azo dye represented by the formula P--N.dbd.N--B being released imagewise at the same time;P represents a monocyclic, carbocyclic aromatic group;B represents a bicyclic, carbocyclic aromatic group which carries a sulphonamide group in the p-position to the azo group;N=0 or 1.

Abstract: Non-diffusible silver halide development inhibitor releasing thioether compounds in which a color development does not give rise to a substantial formation of permanent dyes are 1,2,5'-.DELTA..sup.2 -thiadiazoline-1,1-dioxide derivatives of the following formula or its tautomeric (.DELTA..sup.3) form: ##STR1## in which X represents an aliphatic, aromatic or heterocyclic group such that when it is split off together with the sulphur atom of the thioether bridge, it forms a diffusible mercapto compound capable of inhibiting the development of the silver halide;R.sup.1 represents hydrogen, alkyl, aryl or a heterocyclic group andR.sup.2 represents hydrogen, alkyl, aryl, a heterocyclic group or preferably acyl.

Abstract: Suitable masking compounds for masking the undesired color side densities of image dyes produced from color couplers are those of the following formula ##STR1## in which R.sup.1 represents hydrogen or one or more substituents such as halogen, alkyl, aryl, a heterocyclic group alkoxy, hydroxyl, amino, acylamino, sulfo, sulfonyl, carboxyl or carbamyl or condensed carbocyclic or heterocyclic ring.R.sup.2 represents alkyl, aryl, a heterocyclic group carboxyl or esters or amide derived from carboxylX represents a dye group optionally containing a solubilizing group.On development with black-and-white or color-forming developers the dye group is released imagewise and is removed by aqueous processing baths leaving back a positive color or masking image.

Abstract: Positive images including color images are obtained by imagewise exposure and development of a material which comprises at least one light-sensitive silver halide emulsion layer which contains an unfogged direct-positive silver halide emulsion, when the development is carried out in the presence of a fogging agent of the formula ##STR1## wherein the symbols are defined as hereinafter. The fogging agent is preferably contained in a layer of the material and more preferably in the unfogged direct-positive silver halide emulsion layer. For the production of color instant images the material may also contain non-diffusible color providing compounds capable in their oxidized form of being split under alkaline photographic development conditions to release diffusible dyes.

Abstract: Non-diffusible dye-providing compounds for the dye diffusion transfer process yielding yellow to red color images of wanted absorption characteristics and improved light fastness correspond to the formula(A.sup.1).sub.n -- D -- N .dbd. N -- Py -- (A.sup.1).sub.1-nin whichA.sup.1 represents an oxidizable organic carrier residue which may be attached through a connecting member X and containing a group which confers diffusion resistance, from which carrier residue, either in its oxidized or in its unoxidized form, a part is split off together with the group which confers diffusion resistance under alkaline photographic development conditions, a diffusible azo dye represented by the formula P--N.dbd.N--B being released imagewise at the same time;D represents a heterocyclic or carbocyclic aromatic group;Py represents a pyridine or 1,2-dihydropyridine group which is attached to the azo group through its 3-position and carries an amino or hydroxyl group in its 6-position;N = 0 or 1.

Abstract: In the photographic dye-diffusion transfer process use is made of dye-giving compounds, which are non diffusing in photographic binder layers, and which during development if oxidized imagewise in accordance with the silver halide developed are split owing to the alkali of the developer composition to release diffusing dyes, which are transferred to an image-receiving layer. The dye-giving compounds have the formulaY--NH--Ar--NH--SO.sub.2 --Xar represents an arylene radical such that the group Y--NH-- is attached to the group --NH--SO.sub.2 --X through a chain of n(n=1,2,3, or 4) vinylene groups which are part of the arylene radical;X represents the radical of a dye or dye precursor;Y represents a --COR or --SO.sub.2 R radical; andR represents an alkyl, aryl or heterocyclic group and can constitute part of a second dye moiety.

Abstract: High edge effects and interimage effects are provided in a color-photographic material by the use of new DIR-compounds. These are of the formula ##STR1## wherein X represents together with the sulfur atom a development inhibiting group;Y represents --O--, ##STR2## methylene group which may be alkyl substituted or a methine group; Z represents a methylene or ethylene group which may be alkyl substituted, a methine group, a vinylene group, an o-phenylene group, a carbonyl group, an oxycarbonyl group or a carbonamide group;R.sup.1 and R.sup.2 represent aliphatic, araliphatic or aromatic groups, acyl, acyloxy, alkoxy, aryloxy, amino, halogen, cyano, thioether groups or arylsulfoxyl or alkylsulfoxyl or both R.sup.1 and R.sup.2 together complete an at least mono-unsaturated or aromatic ring.

Abstract: A color photographic material having a silver halide emulsion layer and containing a thioether compound which is reactable on chromogenic development thereby releasing a diffusible substance which inhibits the development of the silver halide.The thioether compound is a homophthalimide containing a removable mercapto group containing moiety in the 4-position and its nitrogen in the 2-position atom being a tertiary nitrogen.

Abstract: A method is described for the preparation of a 1-substituted 4-methyl-2-pyrazolin-5-one by catalytic hydrogenation under pressure and simultaneous methylation by means of paraformaldehyde of the appropriate 1-substituted 2-pyrazolin-5-one in a medium of an inert organic solvent comprising ammonium acetate.