Agfa-gevaert Ag

Agfa-gevaert

Agfa Ag

Ralf Wichmann

Gustav Tappe

Ubbo Wernicke

Heinz Meckl

Peter Bell

Friedrich-Wilhelm Kunitz

Reinhart Matejec

Cuong Ly

Thomas Stetzer

Edgar Draber

Norman Klaunzer

Thomas H&uuml;bsch

Jurgen Haekel

Eltjo Boelema

A bleach or bleach/fixing solution for processing photographic silver halide materials which, relative to the silver halide content of the unprocessed material, exhibit prior to the bleaching step a content of silver arising from development of at least 65 mol %, in particular for processing color reversal materials, characterized in that the solution contains at least one iron complex of propylenediaminetetraacetic acid or of &bgr;-alaninediacetic acid or a mixture of these complexes and the total concentration of the stated iron complexes in the solution is at least 0.045 and at most 0.25 mol/l and a process for processing, in which such a solution is used, is characterized by a small introduced quantity of iron complexes, a low residual silver content, a low bleaching fog value, elevated resistance to precipitation and in that the bleach solution may be rejuvenated.

Bleach bath

Photographic black-and-white reversal first developer

A bleaching bath for photographic black-&-white silver halide materials characterised by the combination of at least 2 oxidising agents having an oxidising potential of .gtoreq.500 mV, optionally together with a metal salt having a stabilising action of a metal of subgroups 1 or 2 of the periodic system of elements, wherein, in the event that dichromate is used as one of the oxidising agents, it is used in a quantity of at most 3.4 mmol/l.

Bleaching bath for photographic black-&-white material

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 color photographic silver halide material in which at least one silver halide emulsion consists of 85 to 99 mol-% AgCl, 1 to 10 mol-% AgI and 0 to 5 mol-% AgBr has high sensitivity (camera sensitivity) and can be developed in at most 120 s.

Color photographic silver halide material

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

Iron(III)-complexes of compounds of the formula ##STR1## wherein R.sub.1 denotes a substituent,

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Bergisch Gladbach, Germany

Ralf Wichmann