Agfa-Gevaert Ag

Agfa-Gevaert

Agfa Gevaert Nv

Agfa Ag

Agfa-Gavaert, A.g.

Gustav Tappe

Heinz Meckl

Ralf Wichmann

Wolfgang K&ouml;rner

Helmut Haseler

Norman Klaunzer

Wolfgang Schmidt

Ubbo Wernicke

Hans Ohlschlager

Edgar Draber

Werner Berthold

Erika Spriewald

Dieter Rockser

Gerhard Schmid

Matthias Porger

Eltjo Boelema

A two-part color photographic developer concentrate in which part 1 contains at least one antioxidant selected from the group consisting of diethylhydroxylamine and diethylhydroxylamine disulfo acid, at least one auxiliary solvent, at least one optical brightener and at least one color developer substance and part 2 contains at least one buffer substance, alkali and at least one water softener, may be produced by part 1 additionally containing 0.001 to 1 mol of hydroxylamine or a monoalkylated hydroxylamine or the salts thereof per liter of concentrate concentrate and at least 20% by weight of the total of part 1 being water.

Color photographic developer concentrate

A concentrated aqueous solution of a p-phenylenediamine derivative, which a) has a pH higher than 12.5, b) contains 0.4 to 1.1 mol p-phenylenediamine derivative/litre, c) contains 0.05 to 2 mol of an antioxidant/litre, d) contains at most 35% by weight of organic solvents with respect to the total solution, e) contains at most 50 mmol sulphate ions/litre and f) is single-phase, is suitable for the production of different colour developer formulations.

Concentrate comprising a p-phenylenediamine derivative

A one-part colour developer concentrate which contains at least one colour developer substance, at least one antioxidant, at least one water softener, a buffer system, alkali, which concentrate contains at most 0.1 mol of sulfate ions/L, is usable for a wide range of regeneration rates and exhibits no precipitation at down to &minus;7&deg; C. if it is prepared as a multi-phase concentrate using organic, water-soluble solvents.

A one-part color developer concentrate which comprises at least two phases and which is free from precipitates at 20&deg; C., which contains at least one color developer substance, at least one antioxidant, at least one anti-lime agent, a buffer system and alkali, one phase of which is aqueous and the other phase of which is organic, wherein the aqueous phase has a pH of at least 9, is obtained when the concentrate has a concentration of cations from 0.5 to 15 mol/l, wherein at least 10 mol % of the cations are sodium ions and the organic phase is formed from one or more water-soluble solvents, and wherein 50 to 95% by weight of the sum of water and water-soluble solvents is water.

Oxonol dyes of the formula I ##STR1## in which R.sub.1, R.sub.2 mean an optionally substituted furyl or thienyl group,

Photographic recording material

This invention relates to a fixing bath containing a biologically degradable complexing agent of formula I ##STR1## wherein R.sup.1-4 represents hydrogen, C.sub.1 -C.sub.10 -alkyl, hydroxy-C.sub.1 -C.sub.10 -alkyl, C.sub.1 -C.sub.10 -alkoxy-C.sub.1 -C.sub.10 -alkyl, carboxy-C.sub.2 -C.sub.10 -alkyl, dicarboxy-C.sub.1 -C.sub.10 -alkyl, carboxy-hydroxy-C.sub.1 -C.sub.10 -alkyl, hydroxy-C.sub.1 -C.sub.5 -alkyl-(oxy-C.sub.1 -C.sub.5 -alkyl).sub.n, or C.sub.1 -C.sub.5 -alkoxy-C.sub.1 -C.sub.5 -alkyl-(oxy-C.sub.1 -C.sub.5 -alkyl).sub.n,

Fixing bath

A bleach prepared from an iron (III) complex of a complexing agent of the formula I ##STR1## in which L.sub.1, L.sub.2 mean an optionally substituted alkylene group with 1 to 4 C atoms

Bleach

A readily biodegradable bleaching bath having an adequate bleaching effect

Bleaching bath

The process for bleach fixing an exposed and developed color photographic material whose silver halide emulsion layers contain silver chlorobromide emulsions having a silver bromide content of from 0.3 to 2.0 mol%, in which the bleach fixing bath (1) contains, as bleaching agent, an iron(III) complex at least 50 mol% of whose complex former corresponds to the following formula ##STR1## (2) is adjusted to a pH of x where 7.0&gt;.times.&gt;4.5 and (3) contains a thiosulphate is distinguished by a powerful bleaching action and great environmental compatibility.

Bleach fixing process

The present invention relates to a photographic reversal process for the production of positive photographic images by imagewise exposure of the photosensitive material containing at least one silver halide emulsion layer, black-and-white first development of the material, chemical fogging or diffuse second exposure and subsequent color development, characterized in that

Photographic reversal process

A processing method without washing gives good photographic properties, without a precipitate being deposited in the stabilizing bath, when the bleach-fixing bath contains a compound of the formula

Photographic processing method

In a process for the processing of color photographic silver halide material which has been exposed to form an image by development, bleachfixing, washing or stabilization and drying, the aqueous developer solution being free from benzyl alcohol, the pH value of the bleachfixing solution, which contains an iron(III) complex salt, being below 7 and the bleachfixing solution containing a compound corresponding to general formula (I) ##STR1## in which Z represents the atoms required to complete an optionally further substituted heterocyclic ring and

Growing community of inventors

Leverkusen, Germany

Gustav Tappe