Agfa-gevaert Ag

Agfa-gevaert Aktiengesellshcaft

Karl Frank

Hans-Dieter Block

Erich Wolff

Heinrich Odenwalder

Wolfgang Himmelmann

Immo Boie

Friedrich-Wilhelm Kunitz

Manfred Peters

Gunther Schenk

Kaspar Wingender

Thomas Kaluschke

Arnfried Melzer

Max Heilmann

Reinhard Muller

The one-part aqueous bleaching bath concentrate containing an ammonium iron (III) complex salt concentration of at least 0.4 mol per liter, an ammonium bromide concentration of from 1.5 to 3 mol per liter, an ammonium nitrate concentration of from 0.25 to 1 mol per liter and a pH below 3 is stable in storage.

Bleaching bath concentrate

Water-soluble substantially non-hardening aldehydes or water-soluble substantially non-hardening aldehyde precursor compounds are suitable as fog-reducing compounds for the photographic dye diffusion transfer process in which an imagewise-exposed color photographic recording material containing light-sensitive silver salt and a non-diffusing dye-releasing compound in at least one binder layer arranged on a layer support, is developed, preferably under the effect of heat, to produce a diffusible dye image and in which the diffusible dye image is transferred to an image receptor layer.

Photographic dye diffusion transfer process and color photographic

Bath compositions for bleaching silver halide-containing recording materials contain an N-carboxyalkaneaminoalkane phosphonic acid or a salt thereof.

Bath composition for bleaching photographic recording materials and

New DIR-compounds of the formula ##STR1## are useful in photographic materials and processes.

Photosensitive photographic material, a process for the production of

.beta.-Aminoethyl carbamic acid is useful in photographic baths and developer compositions in order to accelerate the development.

Use of .beta.-aminoethyl carbamic acid for producing photographic baths

A new bath composition for processing photographic materials with at least one silver halide layer is provided in which discolorations caused by Fe III-bleaching agents are prevented by an after-treatment bath comprising phosphoric acid or a phosphonic acid as hereinafter described.

Method of processing photographic materials

A photographic reversal process is provided in which the photographic material is treated with a potential fogging agent in the preliminary bath preceding the color development bath in such a manner as to obviate the disadvantages of known chemical fogging agents.

Photographic reversal process without second exposure

A color developer composition is provided which has substantially improved protection against oxidation of the color developer and excellent sequestering properties characterized in that the composition comprises an .alpha.-aminocarbonyl compound, an organo-phosphonic acid and an aminocarboxylic acid.

Photographic color developer composition

An aqueous alkaline developer mixture for preparing color photographic images containing a color developer of the p-phenylenediamine series a hydroxylamine compound and a hydroxyalkylidenediphosphonic acid or a water soluble salt of the said acid and at least a compound of the aminopolyphosphonic acid or of the aminopolycarboxylic acid series with improved resistance to oxidation and resistance to the formation of chalk deposits and high stability in storage.

Growing community of inventors

Leverkusen, Germany

Karl Frank