US3266895A - Method for processing multilayer color film - Google Patents

Method for processing multilayer color film Download PDF

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Publication number
US3266895A
US3266895A US323586A US32358663A US3266895A US 3266895 A US3266895 A US 3266895A US 323586 A US323586 A US 323586A US 32358663 A US32358663 A US 32358663A US 3266895 A US3266895 A US 3266895A
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United States
Prior art keywords
color
silver halide
boranes
reversal
emulsion layer
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US323586A
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English (en)
Inventor
Philip E Perkins
Herbert L Rees
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Eastman Kodak Co
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Eastman Kodak Co
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Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to US323586A priority Critical patent/US3266895A/en
Priority to BR162432/64A priority patent/BR6462432D0/pt
Priority to ES0305186A priority patent/ES305186A1/es
Priority to DEE28057A priority patent/DE1291624B/de
Priority to FR994441A priority patent/FR1413697A/fr
Priority to BE655631A priority patent/BE655631A/xx
Priority to SE13684/64A priority patent/SE333687B/xx
Priority to NL6413237A priority patent/NL6413237A/xx
Priority to AT961364A priority patent/AT269647B/de
Priority to AT79667A priority patent/AT273669B/de
Priority to CH1468664A priority patent/CH442005A/fr
Priority to DK560064AA priority patent/DK120880B/da
Priority to GB46674/64A priority patent/GB1089991A/en
Priority to GB56422/66A priority patent/GB1089992A/en
Application granted granted Critical
Publication of US3266895A publication Critical patent/US3266895A/en
Priority to MY196924A priority patent/MY6900024A/xx
Priority to MY196925A priority patent/MY6900025A/xx
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
    • G03C5/50—Reversal development; Contact processes
    • 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
    • G03C7/407—Development processes or agents therefor
    • G03C7/413—Developers

Definitions

  • This invention relates to a method for reversal processing of multilayer color films of the reversal type containing silver halide emulsion layers sensitive to different spectral regions and which are reversal exposed and developed with color developing solutions containing color coupled compounds.
  • Color films of the reversal type employed in the process of the present invention usually carry at least three silver halide emulsion layers sensitive to different regions of the spectrum. Frequently the uppermost layer is bluesensitive, the next layer is green-sensitive, while the emulsion layer adjacent to the support is red-sensitive. Between the blue-sensitive and green-sensitive layers there is generally a filter layer for absorbing blue radiation which may be transmitted through the blue-sensitive layer.
  • the multilayer element can also have other interlayers for specialized purposes. Such multilayer color materials have been previously described in the prior art, such as Marines et al., U.S. Patent 2,252,718, issued August 19, 1941.
  • the red-sensitive emulsion layer is then reversal exposed and developed in a color-forming developer composition containing a cyan color forming coupler and a p-phenylenediamine silver halide developing agent whose oxidation product is reactive with a coupler to form a cyan dye image
  • the blue-sensitive emulsion layer is then reversal exposed and developed in a color developer containing a yellow color forming coupler to develop a yellow dye image in the layer, following which the middle green sensitive emulsion layer may be reversal exposed and developed with a color developing solution containing a magenta color forming coupler, or the reversal exposure of the green sensitive emulsion layer may be dispensed with and instead of fogging magenta color developer can be used for forming the magenta image in the green sensitive emul
  • magenta dye can be subsequently developed in the layer which should contain only a yellow dye image. Accordingly, it has been a common practice, following development of the yellow dye image, to employ a black-and-white auxiliary developer which develops any residual silver halide in the blue sensitive emulsion layer.
  • Such an auxiliary developing solution formulated so that it will not excessively fog the still undeveloped silver halide in the middle (magenta) layer will usually not complete development of the top layer unless all the silver halide grains in that layer have been made developable .by adequate exposure to blue light during the reversal print step before the yellow color development step. Because of inadequate protection of the middle layer by the yellow filter layer it is often impossible to fully expose the top layer with blue light without also exposing some of the silver halide grains in the middle layer. If some middle-layer grains are exposed to blue light before yellow color development, they will be developed in the yellow color developer giving yellow dye contamination in the middle layer.
  • blue light which fully exposes the blue sensitive emulsion layer may also expose some inherently blue light sensitive grains in the middle emulsion layer which is primarily sensitive to green light with the result that yellow dye will be formed in that layer.
  • yellow color developer composition which will fully develop the top layer without giving excessive fog in the middle green sensitive emulsion layer, and when using a loW fogging yellow color developer a black-and-white yellow auxiliary developer often must be used to complete development of the top layer and this may also fog the middle layer.
  • the combined auxiliary developer .and reversal bath of the invention is an alkaline solution of a hydroquinone derivative and a boron compound nucleating agent for silver halide.
  • the hydroquinone derivatives useful in the solution are those soluble in alkaline solution and containing a chain of at least 4 carbon atoms.
  • the higher molecular weight hydroquinone derivatives should also contain solubilizing groups such as sulfo and carboxyl groups to increase the solubility of the compound in alkaline solution.
  • the carbon chain of at least 4 carbon atoms may include the carbon atoms of a cyclic radical for example, as present in the 6-carbon atom chain of the radical -Ocmomof compounds 10'and 11 below.
  • the boron compound nucleating agents for silver halide include boron compounds containing at least one hydrogen to boron bond.
  • the boron compounds include the boranes and 'borazines. Included among the boron compounds are boranes such as the alkali metal borohydrides e.
  • amine such as an aliphatic amine, for example, methylamine, dimethylamine, trimethylamine, ethylamine, ethanolamine, diethylamine, triethylamine, diethanolamine, propylamine, 3- hydroxypropylamine, dipropylamine, tripropylamine, primary-butylamine, secondary-butylamine, tertiary-butylamine, primary-amylamine, secondary-amylamine, tertiary-a-mylamine, etc., a polyamine, for example, ethylenediamine, Z-aminoethylamirie borane, etc, an aromatic amine, for example, aniline, etc, a cyclic amine for example pyridine, 2,6-lutidine, 3,4-lutidine, 2,4-lutidine, Z-ethy
  • aryl phosphine for example, phenylphosphine, etc., an arsine, such as an alkylarsine, for example, methylarsine, dimethylarsine, trimethylarsine, propylarsine, primarybutylarsine, secondary-butylarsine, amylarsine, etc., an arylarsine, for example, phenylarsine, etc., a stibine, such as an alkylstibine, for example, methylstibine, dirnethylstibine, trimethylstibine, ethylstibine, diethylstibine, tri- 'ethylstibine, propylstibine, primary-butylstibine, secondary-butylstibine, tertiary-butylstibine, etc., an arylstibine, for example, phenylstibine; and borazine nucleating agents of the formula:
  • R, R and R" each represent a hydrogen atom
  • a halogen atom such as chlorine, bromine, fluorine, iodine
  • an alkyl group preferably lower alkyl, such as methyl, ethyl, propyl, butyl, etc.
  • an alkoxy group preferably lower alkoxy, such as methoxy, ethoxy, propoxy, butoxy, etc.
  • boron compound nucleating agents of the invention include the following typical examples which are illustrative and not intended to limit the invention:
  • the borazines are synthesized by condensation of diborane with the appropriate nitrogen compound.
  • borazine is made by condensing diborane with ammonia.
  • N,N',N"-trialkyl borazine is produced by condensing diborane With the corresponding N-alkyl amine.
  • An N,N-dialkyl borazine is produced by condensing diborane with a mixture of ammonia and the appropriate N-alkylamine.
  • any residual undeveloped silver halide in the blue sensitive emulsion layer is thereby nucleated and reduced to silver without development of the silver in the adjacent green sensitive emulsion layer.
  • the bath is also effective to nucleate the silver halide of the green sensitive emulsion layer Without developing the silver halide thereof with the result that subsequently a conventional fogging or non-fogging color developer containing a magenta color forming coupler can be used. Accordingly, in the reversal exposure of the blue sensitive emulsion layer it is not necessary to completely expose the silver halide with the concomitant effect that there is less 'danger of exposing the adjacent green sensitive layer which is inherently sensitive to blue light.
  • hydroquinone derivatives useful in a combined developer and reversal bath are those which are soluble in alkaline solution and containing a chain of at least 4 carbon atoms such as present in the following compounds. Included among the hydroquinones are the alkali soluble alkyl hydroqu'inones, the alkyl group of which contains at least 4 carbon atoms, preferably 4 to 20 carbon atoms.
  • the 2,S-dihydroxyacyclophcnones containing 8-10 carbon atom acyl groups, as in compounds 5, 6 and 7 below, are very useful.
  • hydroquinone derivatives such as n-propyl hydroquinone are not useful in the process of the invention because they tend to cause development of the green sensitive emulsion layer to take place at the time the residual blue sensitive silver halide of the blue sensitive layer is being developed.
  • hydroquinone derivatives 2,5-di-t-butylhydroquinone, n-decylhydroquinone, laurylhydroquinone, cyclohexylhydroquinone and 2,S-di-cyclohexylhydroquinone are not useful in the process particularly because of low solubility in the borohydride solution.
  • the alkaline solutions containing the effective hydroquinone derivatives and boron compounds should be strongly alkaline having a pH of at least 10. About 0.05 gram to about grams or more of the boron compounds may be used and from about 0.05 to 5.0 grams or more of the hydroquinone derivative per liter of solution. However, the quantity of boron compound and hydroquinone derivative used will depend in part upon the activity of these materials. In general too high a concentration may be expected to cause unwanted development of the green sensitive (inner) emulsion layer during treatment of the blue sensitive (outer) emulsion layer with the alkaline solutions of boron compounds and hydroquinone derivative.
  • the time of treatment of the films with the alkaline solutions of the invention can vary from about 15 to seconds depending in part upon the temperature, concentration and type of boron and hydroquinone compounds used. Treatment of the films for too long can be expected to cause loss of dye image (magenta) in the inner emulsion layer or too short a treatment with the alkaline solutions can cause development of magenta dye in the outer emulsion layer where only yellow dye should be developed.
  • the alkaline component of the solution may be strong organic or inorganic alkali such as alkali metal hydroxide and quaternary ammonium hydroxide. Other addenda commonly used in photographic developer compositions may be added.
  • the photographic elements to which our invention may be applied are those containing at least two silver halide emulsion layers, preferably gelatin silver halide emulsion layers, primarily sensitive to diflferent spectral regions.
  • one emulsion layer is blue sensitive and the other emulsion layer or layers are green or red light sensitive.
  • the blue sensitive emulsion layer is preferably the outermost layer.
  • the boron compound-hydroquinone derivative compositions can be used in those cases where a red or green light sensitive emulsion layer is the outermost layer to limit the nucleation and reduction of the residual silver halide of that layer to the exclusion of the other layer. Ordinarily the combined nucleating and developing activity of the boron compound-hydroquinone derivative compositions is confined to an outer silver halide emulsion layer although an underlying emulsion layer will usually be nucleated by the borohydride component of the solution.
  • Our invention is primarily directed to the use of the ordinarily employed gelatino-silver-halide developing-out emulsions, e.g., gelatino-silver-chloride, -chlorobrornide, -chloroiodide, -chlorobromiodide, -bromide and bromiodide developing-out emulsions.
  • gelatino-silverbromiodide emulsions excellent results can also be obtained using other photographic silver halide emulsions.
  • These emulsions can be coated in the usual manner on any suitable support, e.g., glass, cellulose nitrate film, cellulose acetate film, polyester film, polyvinyl acetal resin film, paper, metal, etc.
  • Example 1 Sodium sulfite (anhydrous) g 80.0 N-methyl-p-aminophenol sulfate g 5.0 Hydroquinone g 2.0 Sodium carbonate (monohydrate) g 25.0 Sodium bromide g 2.0 Potassium iodide (0.1% solution) cc 2.0 Isopropylamine g 6.0
  • red sensitive emulsion layer of the film was reversal exposed through the support using red light and the film was then developed in a cyan color developer com-position such as the following:
  • the outer blue sensitive emulsion layer was incompletely exposed using blue light so as not to expose the underlying green sensitive emulsion layer; thereafter yellow color development was carried out in a color developer solution such as described above except containing as the coupler w-benzoylacetanilide, thereby forming a subtractively colored yellow dye image in the layer.
  • the film was then treated for 30 seconds at 80 F. with the following bath to nucleate and develop the residual silver halide in the blue sensitive emulsion layer and to nucleate the silver halide in the green sensitive emulsion layer.
  • the film was developed in a color developer composition such as described above except containing as the magenta color forming coupler l-p-nitrophenyl-3-methyl-5-pyrazolone.
  • the film was treated to remove the silver therefrom, by washing first for 5 minutes and then treating for 2 minutes in a silver bleach bath having the following composition:
  • the film was then treated for 2 minutes in a fixing bath having the following composition:
  • the film was then washed for 5 minutes and dried.
  • magenta and yellow positive images were obtained in the red, green and blue sensitive emulsion layers, respectively, and it was apparent therefrom that the borohydride-hydroquinone derivative bath had been particularly effective to prevent the development of magenta dye in the blue sensitive emulsion layer and the development of yellow dye in the green sensitive emulsion layer.
  • Example 2 The process of Example 1 was carried out except using 0.5 gram of 2,5-dihydroxy-nonanophenone, and 0.2 gram of tertiarybutylamine borane instead of KBH with similar results, the proper dye being developed in the blue and green sensitive emulsion layers.
  • Example 3 The process of Example 1 was carried out except using 0.5 gram of 2,5-dihydroxy-n-nonanophenone, and 0.2 gram of dimethylamine borane instead of KBH with similar results, the proper dye being developed in the blue and green sensitive emulsion layers.
  • Example 4 The process of Example 1 was carried out except using 0.5 gram of 2,5-dihydroxy-n-nonanophenone, and 0.2 gram of trimethylamine borane instead of KBH with similar results, the proper dye being developed in the blue and green sensitive emulsion layers.
  • Example 5 The process of Example 1 was carried out except using 0.5 gram of 2,5-dihydroxy-n-nonanophenone, and 0.4 gram of pyridine borane instead of KBH with similar results, the proper dye being developed in the blue and green sensitive emulsion layers.
  • the first or black-and-white developer used in the process of our invention is generally a rapid developer of the MQ type, i.e., a combination of hydroquinone and Elon (p-N-methylaminophenol) developer, or a Phenidone (a 3-pyrazolidone) developer.
  • Color-forming developers useful in our invention have been previously described in the prior art, and our invention is not to be restricted to the use of any particular color-forming developer.
  • Color-forming developers particularly useful in practicing the process of our invention comprise the aromatic primary amines containing an additional substituent (i.e., additional to the primary amino group) selected from an amino group (substituted or not) and a hydroxyl substituent.
  • Such color developers comprise the phenylenediamines and substituted derivatives thereof containing at least one primary amino group, such as the color-forming developers disclosed in Weissberger US. Patent 2,548,574, dated April 10, 1951, Weissberger et al. US. Patent 2,566,271, dated August 28, 1951, etc.
  • Aminophenols containing at least one primary amino group can also be used as color developers.
  • the usual addends can be incorporated in the color developers, such as strongly alkaline agents (e.g., sodiumcarbonate, potassium carbonate, sodium hydroxide, etc.), restraining agents, such as potassium bromide, stain preventives, such as alkali metal sulfites, etc.
  • strongly alkaline agents e.g., sodiumcarbonate, potassium carbonate, sodium hydroxide, etc.
  • restraining agents such as potassium bromide
  • stain preventives such as alkali metal sulfites, etc.
  • the color-forming compounds or couplers are also used in the color developers.
  • T ypical of such couplers are the following:
  • dihydroxybenzene developing agent which contains a side chain containing at least 4 carbon atoms, said 1,4-dihydroxybenzene compound being rendered non-diifusible by said side chain and thereby being confined substantially to the outermost of said emulsion layers with respect to said support, said boron compound nucleating agent nucleating substantially all previously unexposed silver halide and said 1,4-dihydroxybenzene compound developing to metallic silver substantially only the previously unexposed silver halide in said outermost emulsion layer.
  • a process of producing a photographic color reproduction which comprises exposing to a colored sub ject a photographic element containing at least two photographic silver halide emulsion layers sensitized to different regions of the spectrum, one of the emulsion layers being primarily sensitive to the blue region of the spec trum, developing negative silver images in the exposed element by means of a black anduvhite silver halide de veloping solution, reversal exposing the blue sensitive emulsion layer and developing a colored image therein by treating the element with a photographic color developing solution in the presence of a coupler compound which couples with the oxidation products of the color developer to form a dye image, treating the element with an alkaline solution of an alkali metal borohydride and a hydroquinone derivative which contains a chain of at least 4 carbon atoms, until any residual undeveloped silver halide in the blue-sensitive emulsion layer has been nucleated and reduced to silver and the silver halide in the other emulsion layer has been nucleated, and
  • a process of producing a photographic color reproduction which comprises exposing to a subject a photographic element including red, green, and blue light-sensitive silver halide emulsions superposed in order on a support, developing negative silver images in the exposed element by means of a black-land-white silver halide developing solution, reversal exposing and developing a cyan dye image in the red-sensitive emulsion layer by treating the element with a photographic color developing solution in the presence of a coupler compound which couples with the oxidation products of a color developer to form a cyan dye image, reversal exposing a substantial amount of the residual undeveloped silver halide in the outer blue-sensitive emulsion layer and developing a yellow dye image therein by treating the element With a photographic color developing solution in the presence of a coupler compound which couples with the oxidation products of the color developer to form a yellow dye image, treating the element With an alkaline solution of an alkali metal borohyd'ride and a hydroquinone derivative which contains
  • hydroquin-one derivative is a member of the class consisting of t-butylhydroquinone, n-octylhydroquinone, n-nonylhydroquinone and 2,5-dihydroxyacy-lophenones the acyl group of which contains from 8 to 10 carbon atoms 7.
  • the hydroquinone derivative is a 2,S-dihydroxyacylophenone the acyl group of which contains from 810 carbon atoms.
  • hydroquinone derivative is n-nonylhydroquinone.
  • hydroquin'one derivative is 2,5-dll'lYd'IOXY-Il-OCiQIlOPhl'lOIlC.
  • hydroquinone derivative is 2,5-dihydroxy-n-nonanophenone.
  • hydroquinone derivative is 2,5-dihydroXyn-decanophenone.
  • An aqueous alkaline photographic solution adapted to nucleate and reduce silver halide comprising a boron compound nucleating agent selected from the class consisting of alkali metal borohydrides, borazines, amine boranes, hydrazine boranes, phosphine boranes, arsine boranes and stlbine boranes, an alkali-soluble hydroquinone derivative containing a carbon chain of at least 4 carbon atoms.
  • a boron compound nucleating agent selected from the class consisting of alkali metal borohydrides, borazines, amine boranes, hydrazine boranes, phosphine boranes, arsine boranes and stlbine boranes, an alkali-soluble hydroquinone derivative containing a carbon chain of at least 4 carbon atoms.
  • hydroquinone compound is a member of the class consisting of t-butylhydroq-uinone, n-octylhydroquinone, n-nonylhydroquinone and 2,S-dihydroxyacylophenones the acyl group of which contains from 8 to 10 carbon atoms.
  • hydroq-uinone compound is a 2,5-dihydroxyacylophenone the acyl group of which contains from 8 to 10 carbon atoms.
  • a composition for photographic processing adapted to nucleate and reduce silver halide comprising a boron compound selected from the class consisting of alkali metal borohydrides, boraziines, amine boranes, hydrazine boranes, phosphine boranes, arsine boranes and stibine horanes, and an alkali-soluble hydr-oquinone derivative containing a carbon chain of at least 4 carbon atoms.
  • a boron compound selected from the class consisting of alkali metal borohydrides, boraziines, amine boranes, hydrazine boranes, phosphine boranes, arsine boranes and stibine horanes, and an alkali-soluble hydr-oquinone derivative containing a carbon chain of at least 4 carbon atoms.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
US323586A 1963-11-14 1963-11-14 Method for processing multilayer color film Expired - Lifetime US3266895A (en)

Priority Applications (16)

Application Number Priority Date Filing Date Title
US323586A US3266895A (en) 1963-11-14 1963-11-14 Method for processing multilayer color film
BR162432/64A BR6462432D0 (pt) 1963-11-14 1964-09-08 Processo para processar peliculas coloridas de multicamadas
ES0305186A ES305186A1 (es) 1963-11-14 1964-10-22 Procedimiento de inversion para producir una imagen de color.
DEE28057A DE1291624B (de) 1963-11-14 1964-11-04 Verfahren zur Herstellung von Farbaufnahmen nach dem Umkehrverfahren
FR994441A FR1413697A (fr) 1963-11-14 1964-11-10 Nouveau procédé pour le traitement par inversion de films photographiques comprenant plusieurs couches d'émulsion aux halogénures d'argent et nouveau bain pour la mise en oeuvre de ce procédé
BE655631A BE655631A (de) 1963-11-14 1964-11-12
AT79667A AT273669B (de) 1963-11-14 1964-11-13 Wässeriges photographisches Bad
AT961364A AT269647B (de) 1963-11-14 1964-11-13 Verfahren zur Herstellung farbiger photographischer Bilder
SE13684/64A SE333687B (de) 1963-11-14 1964-11-13
CH1468664A CH442005A (fr) 1963-11-14 1964-11-13 Procédé de photographie en couleur
DK560064AA DK120880B (da) 1963-11-14 1964-11-13 Fremgangsmåde til omvendefarvefremkaldelse samt vandig, alkalisk, fotografisk hjælpefremkalder til anvendelse ved fremgangsmåden.
NL6413237A NL6413237A (de) 1963-11-14 1964-11-13
GB46674/64A GB1089991A (en) 1963-11-14 1964-11-16 Colour reversal process
GB56422/66A GB1089992A (en) 1963-11-14 1964-11-16 Photographic nucleating and developing solution
MY196924A MY6900024A (en) 1963-11-14 1969-12-31 Photographic nucleating and developing solution
MY196925A MY6900025A (en) 1963-11-14 1969-12-31 Colour reversal process

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US323586A US3266895A (en) 1963-11-14 1963-11-14 Method for processing multilayer color film

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US3266895A true US3266895A (en) 1966-08-16

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US (1) US3266895A (de)
AT (2) AT269647B (de)
BE (1) BE655631A (de)
BR (1) BR6462432D0 (de)
CH (1) CH442005A (de)
DE (1) DE1291624B (de)
DK (1) DK120880B (de)
ES (1) ES305186A1 (de)
FR (1) FR1413697A (de)
GB (2) GB1089992A (de)
MY (2) MY6900025A (de)
NL (1) NL6413237A (de)
SE (1) SE333687B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3607345A (en) * 1958-04-26 1971-09-21 Eastman Kodak Co Process for coating photographic emulsion layers
US3650748A (en) * 1968-11-22 1972-03-21 Eastman Kodak Co Photographic reproduction using novel physical developers

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2865747A (en) * 1955-12-22 1958-12-23 Eastman Kodak Co Photographic color development process
US2984567A (en) * 1957-11-29 1961-05-16 Eastman Kodak Co Method for elimination of reversal reexposure in processing photographic films

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE634229A (de) * 1962-07-11

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2865747A (en) * 1955-12-22 1958-12-23 Eastman Kodak Co Photographic color development process
US2984567A (en) * 1957-11-29 1961-05-16 Eastman Kodak Co Method for elimination of reversal reexposure in processing photographic films

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3607345A (en) * 1958-04-26 1971-09-21 Eastman Kodak Co Process for coating photographic emulsion layers
US3650748A (en) * 1968-11-22 1972-03-21 Eastman Kodak Co Photographic reproduction using novel physical developers

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BE655631A (de) 1965-03-01
AT273669B (de) 1969-08-25
MY6900025A (en) 1969-12-31
SE333687B (de) 1971-03-22
FR1413697A (fr) 1965-10-08
NL6413237A (de) 1965-05-17
MY6900024A (en) 1969-12-31
AT269647B (de) 1969-03-25
DE1291624B (de) 1969-03-27
GB1089992A (en) 1967-11-08
ES305186A1 (es) 1965-03-01
GB1089991A (en) 1967-11-08
CH442005A (fr) 1967-08-15
BR6462432D0 (pt) 1973-09-11
DK120880B (da) 1971-07-26

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