CH305741A - Process for preparing photographic attenuators and bleach-fix baths. - Google Patents
Process for preparing photographic attenuators and bleach-fix baths.Info
- Publication number
- CH305741A CH305741A CH305741DA CH305741A CH 305741 A CH305741 A CH 305741A CH 305741D A CH305741D A CH 305741DA CH 305741 A CH305741 A CH 305741A
- Authority
- CH
- Switzerland
- Prior art keywords
- complex salts
- iron complex
- dependent
- acids
- iron
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 238000000034 method Methods 0.000 claims description 25
- -1 iron complex salts Chemical class 0.000 claims description 18
- 239000002253 acid Substances 0.000 claims description 13
- 150000007513 acids Chemical class 0.000 claims description 12
- 150000003839 salts Chemical class 0.000 claims description 8
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical class OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims description 6
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims description 5
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 5
- 150000007524 organic acids Chemical class 0.000 claims description 4
- 235000005985 organic acids Nutrition 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- QEVGZEDELICMKH-UHFFFAOYSA-N Diglycolic acid Chemical class OC(=O)COCC(O)=O QEVGZEDELICMKH-UHFFFAOYSA-N 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims description 2
- 125000004429 atom Chemical group 0.000 claims description 2
- 125000005842 heteroatom Chemical group 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 claims 9
- 239000004215 Carbon black (E152) Substances 0.000 claims 6
- 229930195733 hydrocarbon Natural products 0.000 claims 6
- 125000001841 imino group Chemical group [H]N=* 0.000 claims 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 claims 1
- TVMUHOAONWHJBV-UHFFFAOYSA-N dehydroglycine Chemical compound OC(=O)C=N TVMUHOAONWHJBV-UHFFFAOYSA-N 0.000 claims 1
- 239000003599 detergent Substances 0.000 claims 1
- 235000021190 leftovers Nutrition 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 239000002904 solvent Substances 0.000 claims 1
- 239000011593 sulfur Substances 0.000 claims 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 10
- 235000019345 sodium thiosulphate Nutrition 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000004133 Sodium thiosulphate Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 3
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000004061 bleaching Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229960001484 edetic acid Drugs 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 description 2
- 229940072033 potash Drugs 0.000 description 2
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 235000015320 potassium carbonate Nutrition 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 description 2
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 1
- ZDTWZLUYUOLOFP-UHFFFAOYSA-N 2-[(2-carboxyethylamino)methyl]butanoic acid Chemical compound C(C)C(C(=O)O)CNCCC(=O)O ZDTWZLUYUOLOFP-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- BZORFPDSXLZWJF-UHFFFAOYSA-N N,N-dimethyl-1,4-phenylenediamine Chemical compound CN(C)C1=CC=C(N)C=C1 BZORFPDSXLZWJF-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- ZMZDMBWJUHKJPS-UHFFFAOYSA-M Thiocyanate anion Chemical compound [S-]C#N ZMZDMBWJUHKJPS-UHFFFAOYSA-M 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 235000011126 aluminium potassium sulphate Nutrition 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- KZTASAUPEDXWMQ-UHFFFAOYSA-N azane;iron(3+) Chemical compound N.[Fe+3] KZTASAUPEDXWMQ-UHFFFAOYSA-N 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- QXDMQSPYEZFLGF-UHFFFAOYSA-L calcium oxalate Chemical compound [Ca+2].[O-]C(=O)C([O-])=O QXDMQSPYEZFLGF-UHFFFAOYSA-L 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- FXDWOKJYEDVJME-UHFFFAOYSA-N ethene;2-sulfanylacetic acid Chemical compound C=C.OC(=O)CS.OC(=O)CS FXDWOKJYEDVJME-UHFFFAOYSA-N 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 235000011087 fumaric acid Nutrition 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 229940049920 malate Drugs 0.000 description 1
- 239000001630 malic acid Substances 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 229940050271 potassium alum Drugs 0.000 description 1
- GRLPQNLYRHEGIJ-UHFFFAOYSA-J potassium aluminium sulfate Chemical compound [Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRLPQNLYRHEGIJ-UHFFFAOYSA-J 0.000 description 1
- VSRUWRBJHJVUDC-UHFFFAOYSA-L potassium;2-hydroxy-2-oxoacetate;iron(3+);oxalic acid Chemical compound [K+].[Fe+3].OC(=O)C(O)=O.OC(=O)C([O-])=O.OC(=O)C([O-])=O VSRUWRBJHJVUDC-UHFFFAOYSA-L 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- VAVPGQSSOJBZIP-UHFFFAOYSA-N sodium;iron(3+) Chemical compound [Na+].[Fe+3] VAVPGQSSOJBZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- UVZICZIVKIMRNE-UHFFFAOYSA-N thiodiacetic acid Chemical compound OC(=O)CSCC(O)=O UVZICZIVKIMRNE-UHFFFAOYSA-N 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 230000002747 voluntary effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
- G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
- G03C7/42—Bleach-fixing or agents therefor ; Desilvering processes
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Description
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Verfahren zur Herstellung photographischer Abschwächer und Bleichfixierbäder. Es ist bekannt, zur Herstellung photographischer Abschwächer oder kombinierter Bleichfixierbäder ein Gemisch eines Oxydationsmittels mit Natriumthiosulfat zu verwenden. Solche Ansätze sind unter dem Namen Farmerscher Abschwächer im Gebrauch. Der Nachteil dieser Bäder ist aber, dass die Haltbarkeit sehr gering ist.
Im Farbentwicklungsgang, der später silberfreie reine Farbstoffbilder liefern soll, ist es daher üblich geworden, das Bleichen sowie das Fixieren in zwei getrennten Operationen durchzuführen, wodurch noch eine Zwischenwässerung notwendig wird. Dadurch wird beim Entwicklungsgang bei der Farbenphotographie nach dem Farbentwicklungsverfahren gegenüber der Schwarzweissentwicklung ein grösserer Aufwand an Material und Zeit notwendig.
Der Entwicklungsgang kann aber genau so einfach wie beim Schwarzweissfilm gestaltet werden durch Verwendung von kombinierten Bleichfixierbädern, die über eine längere Zeitdauer haltbar sind. Zur Verwendung als Abschwächer bei Schwarzweissfilmen kennt man neben dem wenig haltbaren Farmersehen Abschwächer den Belitzki-Ab- schwächer, der aus einer Kombination von Kaliumferrioxalat und Natriumthiosulfat in wässriger Lösung besteht.
Dieser besitzt bessere Haltbarkeit, beeinflusst aber die Farb- bilder und hinterlässt im Film Ausscheidungen von Calciumoxalat.
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von Abschwächern und Bleichfixierbädern für photographische Zwecke, dadurch gekennzeichnet, dass man eine Lösung bereitet, die Fixiermittel und Eisen(III)-komplexsalze organischer Säuren folgender Konstitution HOOC-R-COOH,, worin R einen zweiwertigen organischen Rest bedeutet, enthält; insbesondere eignen sich Eisenkomplexsalze von Säuren der allgemeinen Formel HOOC-R1-X R2-COOH, worin X ein zweiwertiges Atom oder Radikal, R1 und R2 organische Reste bedeuten.
Hierin kann X stehen für -C-, 0, S, NH, NR3, worin R3 ein organischer Rest ist, der auch substituiert sein kann.
Es hat sich gezeigt, dass solche als Abschwächer für Schwarzweissmaterial oder als Bleichfixierbäder für Farbfilm verwendbare Bäder grosse Haltbarkeit aufweisen. Die Eisenkomplexsalze können entweder in fertig vorgebildeter Form ztun Ansatz der Bäder verwendet werden, oder aber sie können auch durch Zugabe entsprechender Komponenten im Bade selbst erst gebildet werden.
Säuren, die solche Ferri-Eisen-Komplexe bilden, sind beispielsweise Malonsäure, Äthyl-
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malonsäure, Weinsäure, Apfelsäure, Fumar- säure, Diglykolsäure, Thiodiglykolsäure, Äthyl- iminodipropionsäure, Aminosäuren gemäss deutscher Patentschrift Nr. 718981, wie z. B. Äthylendiamintetraessigsäure, Aminotriessig- säure.
Mindestens eine der Gruppen R, und R2 kann auch noch durch Heteroatome unterbrochen sein, so dass auch Säuren wie Äthylen- dithioglykolsäure von der Formel HOOC-CH2-S-CH2--CI2-S-CH2-COOH zur Herstellung der erfindungsgemäss anzuwendenden Eisen-Säure-Komplexsalze verwendet werden können.
Die Komplexe selbst sind meist nach den beiden allgemeinen Formeln: K [Fe(Ac)4] oder K3 [Fe(Ac)6] aufgebaut, doch wurden auch andere Konfigurationen festgestellt. Häufig enthalten diese Salze Kristallwasser. Sie sind meist ausgezeichnet durch recht gute Kristallisations- fähigkeit.
Die Bleichwirkung dieser Salze ist ausreichend, tmi in 5 bis 10 Minuten, je nach Konzentration, ein völlig silberfreies und farb- richtiges Bild zu liefern. Damit besteht also z. B. beim Parbentwicklungsverfahren eines Mehrschichtenmaterials mit Farbstoffbildnern in der Schicht der Entwicklungsgang nur noch aus der Behandlung im Farbentwicklungs- uud Bleichfixierbad.
Die Reaktion der Bäder soll möglichst im Bereich von PH = 7 liegen. Höhere Alkalität, beispielsweise PH = 9, stört die Bleichfixier- wirlumg nicht, saureres pg als etwa 5 ist aber unzweckmässig wegen der Beeinflussung mancher Farben. Auch die freiwillige Zersetzung des Natriumthiosulfates nimmt bekanntlich mit steigender saurer Reaktion zu, wohingegen es im neutralen bis alkalischen Medium lange Zeit haltbar ist.
An Stelle des Natritimthiosulfates können auch andere Fixiermittel, wie Thioharnstoff, Rhodanide, Ammoniak und andere benutzt werden. Den Bleichfixierbädern können Zusätze beigegeben werden, die spezielle Funk- tionen, wie Härtung oder Klarhaltung der Weissen, zu erfüllen haben.
Beispiel. 1: Zur Herstellung eines Bleichfixierbades werden 3 g Kaliumeisen(III)-malonat, 8 g Natriumthiosulfat, 1 g Pottasche in 50 cm3 Wasser gelöst.
Das Bad besitzt einen PH-Wert von 6,2. Mit diesem Bad kann ein dichtes Schwarzweissnegativ abgeschwächt werden.
Beispiel 2: 5 g Natrlumeisen(III)-malat, 8 g Natrium- thiosulfat, 5 g sek. Natriumphosphat werden in 50 cm3 Wasser gelöst.
Ein 10 Minuten in einer alkalischen Lösung von Dimethyl-p-phenylendiamin entwik- keltes Farbbild wird 10 Minuten gewässert, anschliessend zur Bleichfixierung 10 Minuten im vorstehend erwähnten Bad behandelt ttud anschliessend 20 Minuten lang gewässert.
Beispiel 3: Als Bleichfixierbad dient eine Lösung von 5 g Ammoniumeisen(III)-aminotriessigsäure- komplex, 10 g Natritlmthiosulfat, 3 cm3 Ammoniak konz. 30 %, 0,5 g Kalitunbromid in 50 eins Wasser.
Das Bad kann in derselben Weise wie in Beispiel 2 angegeben verwendet werden. Beispiel 4: Ein Bleichfixierbad wird hergestellt, indem man 6 g Kaliumeisen(III)-äthyliminodipropio- nat, 10 g Natriumthiosulfat, 2 g Natritunear- bonat sicc. in 50 eins Wasser löst.
Ein wie in Beispiel 2 entwickeltes Farb- papierbild kann im genannten Bad innerhalb 6 Minuten bleichfixiert werden.
Beispiel 5: Ein Bleichfixierbad wird hergestellt, indem man 3 g Natriumeisen(III)-äthylmalonat, 10 g Natritimthiosulfat, 1 g Pottasche, 1 g Kalialaun in 50 cm3 Wasser löst.
Ein wie in Beispiel 2 entwickeltes Farb- bild kann darin gebleicht werden.
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Beispiel 6: Es wird ein Bleichfixierbad durch Vermischung folgender Stoffe hergestellt 2,6 g Tetranatriiunsalz der ÄthyIendiamin- tetraessigsäure, 2,4 g Soda, 1,5 g Ferrichlorid krist., 1,3 g Natriumsulfat, 20 g Natriumthio- sulfat, 50 g Wasser, wobei sich das Eisen (III)- komplexsalz der Äthylendiamin-tetraessigsäure bildet.
Ein zur Herstellung von farbigen photographischen Bildern nach dem Verfahren der chromogenen Entwicklung bestimmtes Material wird nach dem Belichten in üblicher Weise in einem Farbentwickler entwickelt und gewässert. Anschliessend kann dieses Material in einem Bleichfixierbad der vorstehend erwähnten Zusammensetzung behandelt werden.
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Process for preparing photographic attenuators and bleach-fix baths. It is known to use a mixture of an oxidizing agent with sodium thiosulfate for the preparation of photographic attenuators or combined bleach-fix baths. Such approaches are in use under the name of Farmer's attenuator. The disadvantage of these baths, however, is that the shelf life is very short.
In the color development process, which is later to provide pure, silver-free dye images, it has therefore become customary to carry out bleaching and fixing in two separate operations, which means that intermediate washing is necessary. As a result, a greater expenditure of material and time is necessary in the development process in color photography after the color development process compared with black and white development.
The development process can be made just as easy as with black and white film by using combined bleach-fix baths that can be kept for a longer period of time. For use as an attenuator in black-and-white films, in addition to the poorly durable Farmer's attenuator, the Belitzki attenuator is known, which consists of a combination of potassium ferrioxalate and sodium thiosulphate in aqueous solution.
This has better durability, but affects the color images and leaves calcium oxalate precipitates in the film.
The present invention relates to a process for the production of attenuators and bleach-fix baths for photographic purposes, characterized in that a solution is prepared which contains the fixing agents and iron (III) complex salts of organic acids of the following constitution HOOC-R-COOH ,, where R is a divalent organic Remainder means contains; Iron complex salts of acids of the general formula HOOC-R1-X R2-COOH, where X is a divalent atom or radical, R1 and R2 are organic radicals, are particularly suitable.
Here, X can stand for -C-, O, S, NH, NR3, in which R3 is an organic radical which can also be substituted.
It has been shown that baths which can be used as attenuators for black and white material or as bleach-fix baths for color film have a long shelf life. The iron complex salts can either be used in ready-made form for the preparation of the baths, or they can also be formed in the bath itself by adding appropriate components.
Acids that form such ferric-iron complexes are, for example, malonic acid, ethyl
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malonic acid, tartaric acid, malic acid, fumaric acid, diglycolic acid, thiodiglycolic acid, ethyl iminodipropionic acid, amino acids according to German Patent No. 718981, such as. B. ethylenediaminetetraacetic acid, aminotriacetic acid.
At least one of the groups R 1 and R 2 can also be interrupted by heteroatoms, so that acids such as ethylene dithioglycolic acid of the formula HOOC-CH2-S-CH2 - CI2-S-CH2-COOH for the production of the iron to be used according to the invention Acid complex salts can be used.
The complexes themselves are usually built up according to the two general formulas: K [Fe (Ac) 4] or K3 [Fe (Ac) 6], but other configurations have also been found. These salts often contain crystal water. They are usually distinguished by their very good crystallizability.
The bleaching effect of these salts is sufficient to give tmi a completely silver-free and color-correct image in 5 to 10 minutes, depending on the concentration. So there is z. B. in the color development process of a multilayer material with dye formers in the layer, the development process only consists of the treatment in the color development and bleach-fix bath.
The reaction of the baths should be in the range of PH = 7 if possible. A higher alkalinity, for example PH = 9, does not interfere with the bleach-fix properties, but a more acidic pg than about 5 is inexpedient because it affects some colors. It is also known that the voluntary decomposition of sodium thiosulphate increases with increasing acidic reaction, whereas it can be kept for a long time in a neutral to alkaline medium.
Instead of the sodium thiosulphate, other fixing agents such as thiourea, rhodanide, ammonia and others can also be used. Additives can be added to the bleach-fix baths that have special functions, such as hardening or keeping the whites clear.
Example. 1: To prepare a bleach-fix bath, 3 g of potassium iron (III) malonate, 8 g of sodium thiosulphate, 1 g of potash are dissolved in 50 cm3 of water.
The bath has a pH value of 6.2. This bath can be used to weaken a dense black and white negative.
Example 2: 5 g sodium iron (III) malate, 8 g sodium thiosulphate, 5 g sec. Sodium phosphate is dissolved in 50 cm3 of water.
A color image developed for 10 minutes in an alkaline solution of dimethyl-p-phenylenediamine is soaked in water for 10 minutes, then treated for 10 minutes in the above-mentioned bath for bleach fixation and then soaked for 20 minutes.
Example 3: A solution of 5 g of ammonium iron (III) aminotriacetic acid complex, 10 g of sodium thiosulfate, 3 cm3 of concentrated ammonia is used as the bleach-fix bath. 30%, 0.5 g potassium bromide in 50 liters of water.
The bath can be used in the same way as indicated in Example 2. Example 4: A bleach-fix bath is prepared by adding 6 g of potassium iron (III) ethyliminodipropionate, 10 g of sodium thiosulfate, 2 g of sodium carbonate sicc. dissolves in 50 one water.
A color paper image developed as in Example 2 can be bleach-fixed in the bath mentioned within 6 minutes.
Example 5: A bleach-fix bath is prepared by dissolving 3 g of sodium iron (III) ethyl malonate, 10 g of sodium thiosulfate, 1 g of potash, 1 g of potassium alum in 50 cm3 of water.
A color image developed as in Example 2 can be bleached therein.
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EXAMPLE 6 A bleach-fix bath is produced by mixing the following substances: 2.6 g tetra-sodium salt of ethylenediaminetetraacetic acid, 2.4 g soda, 1.5 g crystalline ferric chloride, 1.3 g sodium sulfate, 20 g sodium thiosulfate, 50 g Water, whereby the iron (III) complex salt of ethylenediamine-tetraacetic acid is formed.
A material intended for the production of color photographic images by the chromogenic development process is, after exposure, developed in the usual way in a color developer and washed with water. This material can then be treated in a bleach-fix bath of the above-mentioned composition.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEF0003180 | 1944-11-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH305741A true CH305741A (en) | 1955-03-15 |
Family
ID=7083715
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH305741D CH305741A (en) | 1944-11-27 | 1951-07-18 | Process for preparing photographic attenuators and bleach-fix baths. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH305741A (en) |
-
1951
- 1951-07-18 CH CH305741D patent/CH305741A/en unknown
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