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 processingInfo
- 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
Links
Landscapes
- 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.
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) |
-
1975
- 1975-06-25 IT IT5020875A patent/IT1040707B/en active
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