IT1040707B - Bleach-fix bath contg 1-naphthol-di- or tri-sulphonic acid - preventing discoloration in photographic colour print processing - Google Patents

Bleach-fix bath contg 1-naphthol-di- or tri-sulphonic acid - preventing discoloration in photographic colour print processing

Info

Publication number
IT1040707B
IT1040707B IT5020875A IT5020875A IT1040707B IT 1040707 B IT1040707 B IT 1040707B IT 5020875 A IT5020875 A IT 5020875A IT 5020875 A IT5020875 A IT 5020875A IT 1040707 B IT1040707 B IT 1040707B
Authority
IT
Italy
Prior art keywords
tri
sulphonic acid
iii
print processing
bleach
Prior art date
Application number
IT5020875A
Other languages
Italian (it)
Original Assignee
Ciba Geigy Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB2832874A external-priority patent/GB1473873A/en
Priority claimed from CH725275A external-priority patent/CH610415A5/en
Application filed by Ciba Geigy Ag filed Critical Ciba Geigy Ag
Application granted granted Critical
Publication of IT1040707B publication Critical patent/IT1040707B/en

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  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Abstract

A photographic bleach-fix bath, contng. a mild oxidant (I) and an Ag halide solvent (II), contains 1-hydroxynaphthalene-di- or -tri-sulphonic acid(s) (III), esp. the 3,6-di- or 3,6,8-tri-sulphonic acid, to prevent discolouration. The bath is for colour print processing. Pref. (I) is a Fe(III) chelate complex, Cu(II) complex salt or Co(III) complex, esp. a Fe(III) complex of EDTA, and (II) is an alkali or ammonium thiosulphate and/or thiocyanate, esp. (NH4)2S2O3, which pref. is used in conjunction with Na2SO3 or (NH4)2SO3. The bath pref. contains 0.1-0.3 M EDTA.Fe3NH4, 0.5-1.3 M (NH4)2S2O3, 0.05-0.2 M Na2SO3 or (NH4)2SO3 and 0.1-10, esp. 2.0-5.0 g./l. (III) and has pH 6-8.
IT5020875A 1974-06-26 1975-06-25 Bleach-fix bath contg 1-naphthol-di- or tri-sulphonic acid - preventing discoloration in photographic colour print processing IT1040707B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2832874A GB1473873A (en) 1974-06-26 1974-06-26 Photographic silver halide bleach-fix baths
CH725275A CH610415A5 (en) 1974-06-26 1975-06-05 Bleach-fix baths

Publications (1)

Publication Number Publication Date
IT1040707B true IT1040707B (en) 1979-12-20

Family

ID=25701024

Family Applications (1)

Application Number Title Priority Date Filing Date
IT5020875A IT1040707B (en) 1974-06-26 1975-06-25 Bleach-fix bath contg 1-naphthol-di- or tri-sulphonic acid - preventing discoloration in photographic colour print processing

Country Status (1)

Country Link
IT (1) IT1040707B (en)

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