US2304884A - Color photography - Google Patents
Color photography Download PDFInfo
- Publication number
- US2304884A US2304884A US387450A US38745041A US2304884A US 2304884 A US2304884 A US 2304884A US 387450 A US387450 A US 387450A US 38745041 A US38745041 A US 38745041A US 2304884 A US2304884 A US 2304884A
- Authority
- US
- United States
- Prior art keywords
- dye
- layer
- salt
- maximum
- dyes
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
Links
- 239000000975 dye Substances 0.000 description 76
- 238000000034 method Methods 0.000 description 25
- 230000035945 sensitivity Effects 0.000 description 24
- -1 silver halide Chemical class 0.000 description 23
- 229910052709 silver Inorganic materials 0.000 description 20
- 239000004332 silver Substances 0.000 description 20
- 230000031700 light absorption Effects 0.000 description 19
- 150000003839 salts Chemical class 0.000 description 19
- 239000000839 emulsion Substances 0.000 description 18
- 230000008569 process Effects 0.000 description 17
- 238000010521 absorption reaction Methods 0.000 description 16
- 159000000009 barium salts Chemical class 0.000 description 16
- 159000000000 sodium salts Chemical class 0.000 description 9
- 239000002253 acid Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 5
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 5
- 229910017052 cobalt Inorganic materials 0.000 description 5
- 239000010941 cobalt Substances 0.000 description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 239000003086 colorant Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- RZSYLLSAWYUBPE-UHFFFAOYSA-L Fast green FCF Chemical compound [Na+].[Na+].C=1C=C(C(=C2C=CC(C=C2)=[N+](CC)CC=2C=C(C=CC=2)S([O-])(=O)=O)C=2C(=CC(O)=CC=2)S([O-])(=O)=O)C=CC=1N(CC)CC1=CC=CC(S([O-])(=O)=O)=C1 RZSYLLSAWYUBPE-UHFFFAOYSA-L 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical group [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 108010010803 Gelatin Proteins 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 125000003545 alkoxy group Chemical group 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 2
- IWOUKMZUPDVPGQ-UHFFFAOYSA-N barium nitrate Chemical compound [Ba+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O IWOUKMZUPDVPGQ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004061 bleaching Methods 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229920000159 gelatin Polymers 0.000 description 2
- 239000008273 gelatin Substances 0.000 description 2
- 235000019322 gelatine Nutrition 0.000 description 2
- 235000011852 gelatine desserts Nutrition 0.000 description 2
- 239000001046 green dye Substances 0.000 description 2
- 150000004820 halides Chemical class 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- JBIJLHTVPXGSAM-UHFFFAOYSA-N 2-naphthylamine Chemical compound C1=CC=CC2=CC(N)=CC=C21 JBIJLHTVPXGSAM-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- SJEYSFABYSGQBG-UHFFFAOYSA-M Patent blue Chemical compound [Na+].C1=CC(N(CC)CC)=CC=C1C(C=1C(=CC(=CC=1)S([O-])(=O)=O)S([O-])(=O)=O)=C1C=CC(=[N+](CC)CC)C=C1 SJEYSFABYSGQBG-UHFFFAOYSA-M 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000000980 acid dye Substances 0.000 description 1
- CTWJWSQXAFDUCV-UHFFFAOYSA-N amino nitrate Chemical compound NO[N+]([O-])=O CTWJWSQXAFDUCV-UHFFFAOYSA-N 0.000 description 1
- 150000004982 aromatic amines Chemical class 0.000 description 1
- 125000001769 aryl amino group Chemical group 0.000 description 1
- 150000005840 aryl radicals Chemical class 0.000 description 1
- 239000000987 azo dye Substances 0.000 description 1
- 125000000751 azo group Chemical group [*]N=N[*] 0.000 description 1
- ITHZDDVSAWDQPZ-UHFFFAOYSA-L barium acetate Chemical compound [Ba+2].CC([O-])=O.CC([O-])=O ITHZDDVSAWDQPZ-UHFFFAOYSA-L 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 125000005605 benzo group Chemical group 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 150000001868 cobalt Chemical class 0.000 description 1
- 150000004700 cobalt complex Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- AJDUTMFFZHIJEM-UHFFFAOYSA-N n-(9,10-dioxoanthracen-1-yl)-4-[4-[[4-[4-[(9,10-dioxoanthracen-1-yl)carbamoyl]phenyl]phenyl]diazenyl]phenyl]benzamide Chemical compound O=C1C2=CC=CC=C2C(=O)C2=C1C=CC=C2NC(=O)C(C=C1)=CC=C1C(C=C1)=CC=C1N=NC(C=C1)=CC=C1C(C=C1)=CC=C1C(=O)NC1=CC=CC2=C1C(=O)C1=CC=CC=C1C2=O AJDUTMFFZHIJEM-UHFFFAOYSA-N 0.000 description 1
- 150000004780 naphthols Chemical class 0.000 description 1
- 150000002815 nickel Chemical class 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical class [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 239000001043 yellow dye Substances 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
- G03C7/28—Silver dye bleach processes; Materials therefor; Preparing or processing such materials
- G03C7/29—Azo dyes therefor
Definitions
- This invention relates to color photography and particularly to an improved material for the bleach-out method of color photography.
- Processes of color photography which make use of uniformly dyed silver'halide emulsions, the colored image being formed by destroying'the dye in the regions of a silver or silver salt image;
- the dye incorporated in the gelatin or emulsion may possess a color which is complementary to that of the light which the sensitive emulsion is intended to record or may be such as to transmit it freely.
- This invention relates to processes of the former type in which the dye incorporated in the gelatin i5 630 millimicrons to 600 millimicrons has been or emulsion is complementary in color to that of the light which the emulsion is intended to record.
- the dye which is used has its light absorption maximum at a wave length which is substantially identical with the maximum sensitivity of the emulsion in which the dye is incorporated.
- an object of the present invention to provide a material which" retains the inherent advantage of this type of bleach-out process, affording direct color positives, while increasing the speed of the material.
- Another ob- ,iect is to provide a novel method of coloring emulsion layers for the bleach-out process of'color photography.
- 'A still further'object is to provide a method of increasing the effective sensitivity of silver halide emulsion layers used in the bleachout process of color photography.
- the metallic derivatives so formed have a color which differs from that of.
- the original dye by an amount sufllcient' to cause an appreciable reduction in the light absorption of the dye in the region which the emulsion isin- 1o tended to record and, therefore, an increase inv the elfective sensitivity of the layer is obtained.
- the change in the light absorption of the dye need not be excessive. For example, a change in the absorption maximum of a blue-green dye from found to increase the effective speed ofthe layer in which it is incorporated six times or more.
- Any suitable dyeswhlch give a metallic derive tive, preferably an insoluble derivative, on treatpolyazo' acid dyes.
- the metallic salts are preferably alkaline earthsuch as cobalt or nickel salts or salts of complex cations containing metals. Generally, those metallic salts are preferred which change the light absorption maximum of the dye to a shorter wave length since most absorption bands fall ,ofl' more sharply on the long wave length side of the maxi mum. After exposure of the dyed layer to forlnanirnsoluble derivative or precipitated in the layer by double decomposition of the dye derivative. Some metals may be partially or wholly removed 40 from the dye during development of the layer in the form of their carbonate or sulfites which may be slightly soluble, but it is generally necessary;
- the metal may be fully removed from the layer during bleaching of the dye by using strong acid baths and subjecting the layer to prolonged washing or the metal may be removed from the dye by precipitation within the layer, by treatment with a 7 bath containing a soluble salt such as a sulfate,
- the proposed method may be applied to multi- The following blue-green dyes color photographic processes, for example, a
- Pontamine Fast Green BL three color process using photographic elements 5 solophenyl Fast Blue Green comprising a plurality of differentially colorsensitive layers coated on a single support.
- the dyes of this type are described in Richard a three-color process, for example, a sensitive U. S. Patent 1,829,673, granted October 27, 1931.
- element may comprise a gelatino silver halide They are believed to have the following formula 1 emulsion sensitized to red light and dyed unior substantially similar constitutions:
- Pref- This dye is obtained by diazotizing metanllio erably the diiference in the absorption maximum acid and coupli in d medium with -hflDhcf the dye and its metallic salt should be at least thY am i-S acid.
- diazotizini e result- 20 millimicrons and preferablyfrom to 50 ing dye and coupling in 0 11 medium with 2- millimicrons.
- a silver image or im-' tilin th resulting dye and l p ing inalkalino 1 ages are produced in the layers by primary or medium wi 2 -amino-5-naphthol-7-sulfonio reversal development and a colored image or acid.
- the finished dye as e dium salt orreimages formed by decolorizing or destroying one PO d the ebOVe Structural ula.) or more of the dyes in accordance with well known 241 some 7 a methods such as those described in Christensen I U. s.
- the'remalning silver and 4 silver halide in the layers may be removed in any suitable manner. 248 some The dyes may be restored to their original form posure.
- This dye is prepared by diazotizing 1 mole of l-amino-8-naphthol-3,fi-disulfonic acid and coupling it in acid medium with 1 mole of a-naphthylamine, again diazotizing and coupling in alkaline medium with 1 mole of 1-amino-8-naph- I thol-3,6-disulfonic acid.) 7 t
- the absorption maxima of the above dyes may be shifted toward the shorter wave length by converting the dyes to their barium salts. They may 3 strongly acid bleach baths and long washing times areused.
- Benzo Light Yellow RL (Schultz Lehmann Farbstoiitabellen, 7th edition, No. 307). :This dye is believed to have the following structural formula:
- the above dye may be converted to a form having'its absorption maximum shifted toward shorter wave lengths by treatment with cobalt hexamino nitrate to form a cobalt complex salt.
- Example 1 To a red-sensitized emulsion dyed with Ponta; mine Fast Green 53L or Solophenyl Fast Blue- Green BL there is added a water-soluble barium salt such as barium nitrate or barium acetate in line earth metal salt of a polyazo dye, the sodium an amount of the order of the weight or the dye,
- the dye exists as its sodium salt an excess of barium salt is necessary in order to displace the sodium ions by mass action, the barium salts of the dye being slightly soluble.
- the dye is thus changed from On exposure and processing the layer, the barium is first removed as carbonate or sulflte during development. The dye then reverts to its original color. During bleaching of the layer. the barium will be permanently removedii amino nitrate. The dye becomes nearly colorless by formation of the corresponding salt. on exposure and processing of the layer, the original color of the dye is restored by elimination of the. cobalt complex.
- a light-sensitve silver halide layer for th bleach-out process of color photography effectively sensitive to only one of the primary colors, said layer being uniformly colored with a salt of a polyazo dye selected from the group consisting aialkaline earth metal salts, nickel, and cobalt, the sodium salt of said dye having an absorption maximum at substantially the sensitvity maximum of the layer, but the. first mentioned salt having a light absorption maximum at a sub-- tively sensitive to only one of the primary colors,
- said layer being uniformly colored with an alkasalt 01 said dye having an absorption maximum at substantially the sensitivity maximum oi.
- alkaline earth metal salt having a light absorption maximum at a substantially lower wave length than the sensitivity maximum of said' layer.
- a light-sensitive silver halide layer for the bleach-out-process oi color photography eflectively sensitive to only one of the primary colors
- said layer being uniformly colored with a barium salt of a polyazo dye, the sodium salt of said dye having an absorption maximum at substantially the sensitivity maximum oi the layer but the barium salt having a light absorption maximum at a substantially lower wave length, and
- said barium salt of said dye being convertible after exposure of the layer, to a form having an absorption maximum at substantially the sensitivity maximum of the layer.
- a lightwsensitive gelatino-silverhalide layer for the bleach-out process of color photography colored with the barium salt of a dye having the following formula:
- cobalt salt having a light absorption maximum not corresponding to the sensitivity maximum of the silver halide layer, but the sodium salt of the dye having a light absorption maximum at substantially the sensitivity maximum of the layer.
- the method of increasing the effective sensitivity of a silver halide photographic layer used in the bleach-out process of color photography which comprises converting an azo dye having a light absorption maximum in the region which 'said layer records, into a salt of said dye selected from the group consisting of alkaline earth metal salts, nickel and cobalt, the sodium salt of said for thebleach-out process of color photography colored with the barium salt 01 a dye having the following formula:
- Y hydrogen, methyl, methoxy; and from 1 to 2 Zs of each Iiaphthyl radical are the barium salt of sulfonic acid, the remaining Zs being hydrogen, said barium salt having a light absorption maximum not corresponding to the sensitivity maximum. of the silver halide layer, but the sodium salt 01 the .dye having a light absorption maximum at substantially the sensitivity maximum of the layer.
- a light-sensitive gelatino-silver halide layer for the bleach-out process of color photography uniformly colored with the barium salt of Pontamine Fast Green 53L, said barium salt having a light absorption maximum not corresponding to the sensitivity maximum of the silver halide I layer, but-the sodium salt of the dye having a light absorption maximum at substantially the sensitivity maximum of the layer.
- a light-sensitive gelatino-silver halide layer for the bleach-out process of color photography dye having an absorption maximum at substantially the sensitivity maximum of the layer but said first mentioned salt having a light absorption maximum in a region of substantially lower wave-length and incorporating said salt in said emulsion layer.
- a light-sensitive silver halide layer for the silver bleach-out process ofcolor photography colored with the .barium salt of a dye selected from the group consisting oi dyes having the following structure:
- R- is selected from the class consisting of hydrogen, alkyl, and alkoxy groups
- x is selected from the class consisting of hydrogen, amino, and hydroxyl groups
- Y is selected from the class consisting of arylamino and azo groups
- the naphthol nucleus contains at least one sulfonic acid radical capable of forming said'barium salt
- said barium salt having a light-absorption maximum not corresponding to thesensitivity maximum of the silver halide layer, but the sodium salt of the dye having a light-absorption maxi-v mum at substantially the. sensitivity maximum of the layer.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB6387/40A GB541073A (en) | 1940-04-09 | 1940-04-09 | Process of colour photography and materials therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2304884A true US2304884A (en) | 1942-12-15 |
Family
ID=9813582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US387450A Expired - Lifetime US2304884A (en) | 1940-04-09 | 1941-04-08 | Color photography |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2304884A (fr) |
| FR (1) | FR56699E (fr) |
| GB (1) | GB541073A (fr) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2418624A (en) * | 1943-03-02 | 1947-04-08 | Eastman Kodak Co | Azo dyes for color photography |
| US2612448A (en) * | 1948-04-02 | 1952-09-30 | Gaspar | Photographic elements containing azo dyes and process using them |
| US2681856A (en) * | 1949-04-04 | 1954-06-22 | Gaspar | Photographic material and process for making an azo dye bleachout image |
| US2860975A (en) * | 1956-09-28 | 1958-11-18 | Eastman Kodak Co | Photographic color correction process using 2-azo-1-naphthol dyes |
| US2899305A (en) * | 1957-05-09 | 1959-08-11 | Colour photography | |
| US2956879A (en) * | 1958-01-07 | 1960-10-18 | Eastman Kodak Co | Filter and absorbing dyes for use in photographic emulsions |
| DE1166621B (de) * | 1962-04-10 | 1964-03-26 | Ciba Geigy | Photographische Materialien fuer das Silberfarbbleichverfahren |
| US3178290A (en) * | 1960-07-06 | 1965-04-13 | Ciba Ltd | Photographic layers suitable for the silver dyestuff bleaching method |
| US3185567A (en) * | 1959-07-06 | 1965-05-25 | Polaroid Corp | Photographic color process and product |
| US3202511A (en) * | 1961-02-15 | 1965-08-24 | Ciba Ltd | Photographic layers suitable for the silver dyestuff bleaching process |
| US3218164A (en) * | 1959-01-26 | 1965-11-16 | Polaroid Corp | Novel photographic processes, compositions and products |
| US3230085A (en) * | 1961-04-06 | 1966-01-18 | Polaroid Corp | Photographic products, processes and compositions |
| US3259498A (en) * | 1961-05-30 | 1966-07-05 | Ciba Ltd | Photographic layers suitable for the silver dyestuff bleaching process |
| US3264109A (en) * | 1961-11-02 | 1966-08-02 | Ciba Ltd | Photographic materials for the silver dyestuff bleaching process |
| US4310612A (en) * | 1978-10-10 | 1982-01-12 | Eastman Kodak Company | Blocked photographically useful compounds in photographic compositions, elements and processes employing them |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE23357E (en) * | 1939-08-28 | 1951-04-17 | Processes for producing same | |
| US3077402A (en) * | 1954-12-06 | 1963-02-12 | Polaroid Corp | Photographic color processes, products, and compositions |
-
1940
- 1940-04-09 GB GB6387/40A patent/GB541073A/en not_active Expired
-
1941
- 1941-04-08 US US387450A patent/US2304884A/en not_active Expired - Lifetime
-
1947
- 1947-08-01 FR FR56699D patent/FR56699E/fr not_active Expired
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2418624A (en) * | 1943-03-02 | 1947-04-08 | Eastman Kodak Co | Azo dyes for color photography |
| US2612448A (en) * | 1948-04-02 | 1952-09-30 | Gaspar | Photographic elements containing azo dyes and process using them |
| US2681856A (en) * | 1949-04-04 | 1954-06-22 | Gaspar | Photographic material and process for making an azo dye bleachout image |
| US2860975A (en) * | 1956-09-28 | 1958-11-18 | Eastman Kodak Co | Photographic color correction process using 2-azo-1-naphthol dyes |
| US2899305A (en) * | 1957-05-09 | 1959-08-11 | Colour photography | |
| US2956879A (en) * | 1958-01-07 | 1960-10-18 | Eastman Kodak Co | Filter and absorbing dyes for use in photographic emulsions |
| US3218164A (en) * | 1959-01-26 | 1965-11-16 | Polaroid Corp | Novel photographic processes, compositions and products |
| US3185567A (en) * | 1959-07-06 | 1965-05-25 | Polaroid Corp | Photographic color process and product |
| US3178290A (en) * | 1960-07-06 | 1965-04-13 | Ciba Ltd | Photographic layers suitable for the silver dyestuff bleaching method |
| US3202511A (en) * | 1961-02-15 | 1965-08-24 | Ciba Ltd | Photographic layers suitable for the silver dyestuff bleaching process |
| US3230085A (en) * | 1961-04-06 | 1966-01-18 | Polaroid Corp | Photographic products, processes and compositions |
| US3259498A (en) * | 1961-05-30 | 1966-07-05 | Ciba Ltd | Photographic layers suitable for the silver dyestuff bleaching process |
| US3264109A (en) * | 1961-11-02 | 1966-08-02 | Ciba Ltd | Photographic materials for the silver dyestuff bleaching process |
| DE1166621B (de) * | 1962-04-10 | 1964-03-26 | Ciba Geigy | Photographische Materialien fuer das Silberfarbbleichverfahren |
| US4310612A (en) * | 1978-10-10 | 1982-01-12 | Eastman Kodak Company | Blocked photographically useful compounds in photographic compositions, elements and processes employing them |
Also Published As
| Publication number | Publication date |
|---|---|
| FR56699E (fr) | 1952-10-02 |
| GB541073A (en) | 1941-11-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2304884A (en) | Color photography | |
| US2397452A (en) | Photographic element | |
| DE69013708T2 (de) | Filterfarbstoffe für photographische Elemente. | |
| US3177078A (en) | Filter and absorbing dyes for photographic emulsions | |
| US2342620A (en) | Azo-reversal process of color photography | |
| US3488193A (en) | Silver halide emulsions containing naphthol color couplers | |
| US3053655A (en) | Photographic material and process | |
| US2498418A (en) | Production of azo dyestuff images from n-acyl-n-aryl hydrazine developers | |
| US2266452A (en) | Nitronaphthol coupler for color photography | |
| GB519790A (en) | Colour photographic process | |
| US3157507A (en) | Optical sensitization of photographic materials suitable for the silver-dyebleachingprocess | |
| US3250617A (en) | Photographic elements protected against ultraviolet radiation | |
| US1971430A (en) | Antihalation layer | |
| US2742832A (en) | Controlling grain and contrast in color photography | |
| US3642485A (en) | Color-photographic silver halide materials containing colored and uncolored couplers | |
| US2622026A (en) | Photographic element and tinted film base | |
| US2034220A (en) | Light-sensitive layer and method of producing colored pictures | |
| GB736849A (en) | Improvements relating to dye bleach baths for color photography | |
| US2271230A (en) | Sulphonamides of dyes | |
| US2694636A (en) | Light-sensitive element for color photography | |
| US3251689A (en) | Masking film | |
| US3493372A (en) | Photographic materials and processes | |
| US2688538A (en) | Photographic elements and process of color correction utilizing styryl dyes as couplers | |
| US3615602A (en) | Color-photographic silver halide emulsion containing colored cyan-forming couplers | |
| US2295009A (en) | Photographic color forming compound |