US2947628A

US2947628A - Multilayer print film having incorporated coloring material

Info

Publication number: US2947628A
Application number: US615546A
Authority: US
Inventors: Scheuring S Fierke; Homer W J Cressman
Original assignee: Eastman Kodak Co
Current assignee: Eastman Kodak Co
Priority date: 1956-10-12
Filing date: 1956-10-12
Publication date: 1960-08-02
Anticipated expiration: 1977-08-02
Also published as: BE561521A; FR1212029A; DE1027511B; GB878514A

Description

1960 s. s. FIERKE ET AL 2,947,628

MULTILAYER PRINT FILM HAVING INCORPORATED COLORING MATERIAL.

Filed Oct. 12, 1956 GREEN SENSITIVE SILVERHALIDE MAGENTA OPTICAL SENSITIZING DYE ABSORBED ON INTERNAL LATENT IMAGE SILVER HAL/DE --'\-RED-SEN$/T/VE SILVER HAL/0E- CYAN OPTICAL sENsITIzINs DYE ABSORBED ON INTERNAL LATENT IMAGE EMULSION BLUE SENSITIVE SILVER HAL/DE -$EN$ITIVE SILVER HAL/DE LOIDAL SILVER FILTER LAYER GREEN -$EN$ITIVE SILVER HAL/DE .Ffi 2 FILTER LAYER CONTAIN/N6 cmN OP77CAL SENSITIZ/NG DYE As- SORBED 0N INTERNAL LATENT IMAGE SILVER HAL/DE RE D SENSITIVE SILVER HAL IDE Sclleuring J1 Fierke HomerWJCre ssman IN V EN T 0R5 .ITTTORNEY & AGENT United States P t n MULTILAYER PRINT FILM HAVING INCOR- PORATED COLORING MATERIAL Scheuring S. Fierke and Homer W. J. Cressman, Rochester, N.Y., assignors to Eastman Kodak Company, Rochester, N.Y., a corporation of New Jersey Filed Oct. 12, 1956, Ser. No. 615,546

7 Claims or. 96-74 This invention relates to photography and particularly to a multi-layer photographic film having a light filtering material incorporated therein.

In the usual sensitivity arrangement of three-layer photographic film, the red-sensitive emulsion layer is coated adjacent the support and this is followed in order by the green-sensitive emulsion layer and the blue-sensitive emulsion layer. It is customary to form a cyan dye image in the red-sensitive layer, a magenta dye image in the green-sensitive layer and a yellow dye image in the blue-sensitive layer. It is also well known that a difierent sensitivity arrangement may be used in which either the red sensitive layer or the green sensitive layer is coated outermost for the purpose of improving definition. It is well known that the definition of the resulting color picture is determined to a large extent by the cyan and magenta dye image and that the overall definition can be improved by arranging the three emulsion layers so that the layer containing the cyan or magenta dye image is outermost and the layer containing the yellow dye image is adjacent the support or farthest from the eX- posing light. This arrangement is described, for example, in Baker US. Patent 1,867,301 and Tarbin U.S. Patent 1,871,479.

When this inverted sensitivity order is used, it is frequently necessary to employ a blue-sensitive emulsion layer, that is, the layer adjacent the support, having a higher blue light speed than would be required if the blue-sensitive layer were outermost. Whether for'this or other reasons, it has been found that the blue-sensitive emulsion layer tends to scatter any red or green light reaching it after passing through the upper layers and reflect part of it back to the upper layers, and thereby to reduce the overall definition of the resulting picture. This light scattering in the bottom layer of the film is a serious defect in films using this sensitivity arrangement. It is therefore an object of the present invention to provide a novel means for preventing light-scattering in multilayer films, either of light passing to lower emulsion layers, or of light reflected from lower to upper emulsion layers. A further object is to retain theadvantages of coating the green-sensitive or red-sensitive layer outermost in a multi-layer film and at the same time to reduce or overcome the disadvantage of light scatter caused by the blue-sensitive emulsion, layer. A further object is to provide a novel multi-layer photographic film.

These objects are accomplished by including in one of the layers such as one or more of the emulsion layers or an organic colloid interlayer, an internal latent image silver halide emulsion to which is adsorbed a non-image forming coloring material such as one or more optical sensitizing dyes for silver halide absorbing up to 100% of the light to which any emulsion layer above the colored layer is sensitive and substantially no light to which an emulsion layer below the colored layer is sensitive, and when present in an emulsion layer, the coloring material absorbing up to 75% of the light to which that emulsion ice ' silver halide developing agents to form dyes and generally the color-forming compound in each emulsion is selected to form dye images of color complementary to the sensitivity of the emulsion layer.

The function of the internal latent image emulsion component of the red-sensitive or green-sensitive emulsion-layers or the interlayer is to prevent the wandering of the dyes from grain to grain in the emulsion layer or from emulsion to emulsion. Since the internal latent image emulsions are not developable in the surface developers used in developing the color filmsdescribed,'they do not interfere with the formation of the colored images in the emulsion layers but since the internal latent image emulsions are readily removable from the films in the processing solutions such as the fixing bath, the coloring material is removed from the emulsion layers together with the internal latent image emulsion during the proc-- essing steps.

One advantage of the use of the internal latent image emulsions to which the red-absorbing or green-absorbing dyes are adsorbed, resides in the fact that since nonwandering narrow-band absorbing dyes are .used, the over-all speed of the emulsions is higher by as much as, 0.6 to 0.8 log E than when wider band absorbing and more diifusiblecoloring materials are used for coloring the emulsion layers.

The accompanying drawing shows in cross-sectional view, two modifications of our invention wherein Fig. 1 shows the support 10, suchas a cellulose ester film, base, having thereon a blue-sensitive emulsion layer] 11, a red-sensitive emulsion layer 12 containing a cyanor red-absorbing dye adsorbed onto internal latent image emulsion and a green-sensitive emulsion layer 13 containing a magenta or green-absorbing dye adsorbed onto an internal latent image emulsion, Fig. 2 shows the suppor t lfl having

sensitive emulsion layers

14,15 and 11 sensitive respectively to red, green and blue light, a colloidal silver filter layer 16, and a layer 17 containing magenta optical sensitizing dye adsorbed on, internallatent image silver halide. t

Thefilm used according to. the preferred embodiment of our invention consists of. a suitable support such as cellulose ester, synthetic resin or paper having on one side thereof, suitable subbing layers anda blue-sensitive silver halide emulsion layer coated thereon. This is followed by green-sensitive and red-sensitive silver halide emulsion. layers either of which maybe outermost, although we prefer to coat the green-sensitive emulsion layer last or outermost. Since the green-sensitive and red-sensitive silver halide emulsions are sensitive to blue or violet light in addition to the regions to which they are optically sensitized, it is necessary to prevent the action of'blue or violet light on these layers. This may be accomplished either by using as the bottom layer a blue-sensitive emulsion which has much higher blue speed than the green sensitive and red-sensitive emulsions and exposing the entire film through a yellowfilter which absorbs all blue light to which the upper layers are sensitive but not all blue light to which the bottom layeris sensitive orby, using in the upper layers emulsions consisting principala Patented -Aug. 2,- 196i) ly of silver chloride which has very little sensitivity in the visible blue light region. The emulsion layers contain couplers incorporated as described in Jelley and Vittum U.S. Patent 2,322,027.

According to the preferred embodiment of our invention, the blue-sensitive layer is a silver bromide or silver chlorobromide emulsion sensitive to visible blue light and containing a coupler capable of forming a yellow dye image. The red-sensitive and green-sensitive emulsions are silver chloride or silver chlorobromide emulsions relatively insensitive to visible blue light and containing, respectively, couplers capable of producing cyan and magenta dye images.

The optical sensitizing dyes for silver halide which are adsorbed onto the internal latent image emulsions have narrow-band absorptions primarily in the green or red spectral regions and are strongly adsorbed to the internal latent image emulsion. For example, readily soluble cyanine dyes containing fi-naphthothiazole, S-phenylbenzotriazole, S-chlorobenzotriazole, and -phenylbenzoxazole nuclei are suitable as well as hemi-cyanines, hemioxanols and merocyanines, in particular the partially solubilized merocyanines, examples of which appear hereinafter.

The internal latent image silver halide emulsions to which the coloring materials are adsorbed are well known in the art. The internal latent image emulsions are emulsions which form latent images mostly inside the silver halide grains. An internal latent image emulsion, as described on pages 296 and 297 of Mees The Theory of the Photographic Process, 1942, is especially useful in our invention. Most of the internal latent image emulsions are silver bromo-iodide emulsions of high iodide content, preferably containing at least l0%- 20% 0f iodide. Burtons emulsion is an emulsion of this type, having a silver iodide content of approximately 40% of the content of silver halide. It is not absolutely essential, however, for the emulsion to contain silver iodide.

Burtons emulsion described in Wall, Photographic Emulsions, 1929, pages 52 and 53, is prepared as follows:

B is heated to 70 C., and A, cold, added to B with constant shaking, digested for 20 minutes at 50 C., and

allowed to cool slowly. C is added after being allowed to swell for 20 minutes in water, drained and melted. The emulsion is then set and Washed.

An internal latent image emulsion made as described in the Davey and Knott US. Patent 2,592,250 is particularly useful in our invention. This emulsion is prepared by first forming in the absence of ammonia and in one or more stages silver salt grains consisting at least partly of a silver salt which is more soluble in water than silver bromide, subsequently converting the grains to silver bromide or silver bromoiodide and if the silver iodide content of the emulsion is less than 6% calculated on the total silver halide, treating such grains with an iodide compound to bring the silver iodide up to at least 6%, ripening preferably in the absence of ammonia and then either washing out some of the soluble salts or washing out the whole of the soluble salts, fol lowed by the additionof soluble salts such as soluble chloride or bromide. An example of an emulsion made in this way is as follows:

Solution No. 1:

Inert gelatin 20 grams KCl 20 grams} at 40 C. Water 560 cc. Solution No. 2:

KCl 100 grams a Water 520 cc. i at 45 Solution No. 3: V

AgNO 195 grams Water 520 cc. i at 45 Solution No. 4:

KBr 160 grams KI 40 grams} at 45 C. Water 500 cc.

Run solutions Nos. 2 and 3 simultaneously into solution No. 1 in a vessel, taking seconds to do this. Then ripen for 1 minute at 45 C. Next add solution No. 4, then ripen for 20 minutes at 45 C. Next add 235 grams of inert gelatin (dry). Then ripen at 45 C. for 15 minutes during which time the gelatin dissolves. Set and shred the emulsion and then wash until free from all soluble bromide and then add about 150 cc. of 10% solution of KCl (by weight), and then add water to make 3 /2 liters. The tanning developing agents such as described hereinafter may then be added to the melted emulsion.

An internal latent image type of silver halide emulsion may be defined as one which, when a test portion is exposed to a light intensity scale for a fixed time between and 1 second, and developed for 4 minutes at 20 C. in the ordinary, surface developer (Example I), exhibits a maximum density not greater than /3 the maximum density obtained when the same emulsion is equally exposed and developed for 3 minutes at 20 C. in an internal type developer (Example II). Preferably the maximum density obtained with the surface developer is not greater than the maximum density obtained when the same emulsion is developed in the internal type developer. Stated conversely, an internal latent image emulsion, when developed in an internal type developer (Example II) exhibits a maximum density at least 5, and preferably at least 10, times the maximum density obtained when the same emulsion is exposed in the same way and developed in a surface developer (Example I).

An ordinary, surface-type developer, that is, one which develops an image only on the surface of the grains of an internal latent image emulsion, is the following:

Example I Grams p-Hydroxyphenylglycine v 10 Sodium carbonate (crystals) 100 Water to 1 liter. 7 Development time, 4 min. at 20 C.

An internal type developer, that is, one which develops an image inside the grains of an internal latent image emulsion, is the following:

Water to 1 liter. Development time, 3 min. at 20 C. Y

- 1 "m. ll"...

5, Our invention will now be illustrated by the following examples: Example 1.--Red-sensitive emulsion containing red absorber adsorbed to internal latent image emulsion To a mixture, preheated to 40 C., of 616.0 g. of an internal latent image emulsion prepared by the method of Davey and .Knott above, containing per mole of silver 41.0 g. of a cyan dispersion comprising 3.6 g. of l-hydroxy-2-[-(2,4-diamylphenoxy)-n-butyl] naphthamide, 0.45 g. of 2-hexadecyl-S-methylhydroquinone, 8.1 g. of di-n-butyl phthalate, 24.6 g. of a 10% deashed gelatin solution, and 3.05 ml. of a 5% Alkanol B surfactant solution 214 g. of a red-sensitized chlorobromide emulsion (80 1 percent silver chloride, 20 percent silver bromide) containing 239 grams of gelatin per mole of silver halide in a total weight of 4280 grams per mole .00895 g. of benzothiazole methiodide in 5.3 ml. of water 0.141 g. of mucochloric acid in 5.2 ml. of water 15 ml. of 7 /2% saponin solution Water to a total weight of 525 g.

This red-sensitive emulsion containing a cyan-forming coupler can be cast on a film support provided with a blue-sensitive yellow-forming coupler-containing emulsion layer at a rate of about 17.7 grams per square foot. Over the red-sensitive emulsion layer is coated a greensensitive emulsion layer containing a magenta-forrning coupler and a green light absorbing dye as provided in the following examples. The element can then be exposed in the conventional manner, for example, to a suitable multilayer color negative and dye images developed therein by means of color development. Following removal of the silver images and residual silver halide in the film by bleaching and fixing operations, it is found upon examination of the dye images that the redabsorbing dye adsorbed to the internal latent image emulsion component of the red-sensitive emulsion layer has been removed in the processing solutions along with the internal latent image emulsion, and the dye images possessed a high degree of sharpness. The mentioned speed advantages wereobtained in this case sincethe thiacarbocyanine dye was strongly adsorbed to the internal. latent image emulsion and the dye had a narrow absorption band with a peakabsorption at 680 millimierons.

Example 2.Red-sensitive emulsion containing red absorber adsorbed to internal latent image emulsion An internal latent image emulsion 193.0 g. prepared by the method of Davey and Knott above, containing per mole of silver halide 139.0 g. of gelatin in a total weight of 1930.0 g. was treated with 30 mg. of anhydro-3,3-dip-carboxyethyl-5,5'-dichloro-9-ethylthiacarbocyanine hydroxide in 3.0 ml. of a 1% triethylamine solution diluted toa total volume of 30 ml. with methanol. The weight of the sensitized. emulsion was 220.0 g. r

The final emulsion was then made by mixing the following components: r

88g; of the above internal latent image emulsion containing the thiacarbocyanine red absorber 32.8 g; of the cyan dispersion of Example 1 55.5 g. of a 10% deashed gelatin solution 171.0 g. of the red-sensitive chlorobromide emulsion used in' Example 1.

.0071 g. of benzotriazole methiodide in 4.2 ml. of water .0925 g. of mucochloric acid in 3.4 ml. of water 10 ml. of 7 /z% saponin solution Water to total weight of 344.0 g.

This emulsion can be coated at 14.4 g. per square foot and used as described in Example 1 as the red-sensitive emulsion over a blue-sensitive emulsion. When the thiacarbacyanine dye is used as described as a red absorber, spectrophotometric curves showed a narrow-band absorption with a peak at 642 millimicrons.

Example 3.Red-sensit'ive emulsion containing red absorber absorbed to internal latent image emulsion The procedure of Example 2 was repeated except using as a red absorber in the internallatent image emulsion the dye 3,3-diethyl-5,5-9-triphenylthiacarbocyanine-ptoluene sulfonate. When the emulsion was employed in a color film as described in Example 1, sharp images were obtained due to the sharp absorption band of the dye having a peak at- 626 millimierons.

Example 4.-Green-sensitive emulsion containing green absorber adsorbed to internal latent'image emulsion The internal latent image emulsion (308.0 g.) described under Example 1 was treated in an analogous manner with 20 mg. of 3,3'-9-triethyl-5,5'-diphenyloxacarbocyanine iodide dissolved in 0.4 ml. of pyridine and 25.0 ml. of acetone. The weight of the sensitized emulsion was 315.0 g.

The final emulsion was prepared by mixing the followmg: l

95 g. of the above internal latent image emulsion containing the oxacarbocyanine green absorber 39.5 g. of a magenta dispersion containing 2.7 g. 'of 1- (2,4,6-trichlorophenyl) -3 3-2 (2,4'-di-tertamyl phenoxyacetamido)-benzamido] -5-pyrazolone, 0.63 g. of

2,5-dioctylhydroquinone, 6.65 ml. of 'tri-o-cresyl phosphate, 23.8 g. of a 10% deashed gelatin solution, and 1.97 ml. of a 5% Alkanol B solution 134.0 g. of a green-sensitized chlorobromide emulsion percent silver chloride, 20 percent silver bromide) containing 239 grams of gelatin per mole of silver halide in a total weight of 4,430 g.

0.0054 g. of benzotriazole methiodide in 3.2 ml. of water 0.0896 g. of mucochloric acid in 3.3 ml. of water 10.0 ml. of a 7 /z% saponin solution Water to a total weight of 330.0 g.

When the emulsion was used as described in Example 1 as the green-sensitive emulsion in conjunction with'the red-sensitive emulsion of Example 1, a high degree of sharpness was obtained in the dye images and the green and red absorbers were readily removed with the internal. latent image emulsions in the fixing bath employed after color development.

Example 5.-Green-sensitive emulsion containing green absorber adsorbed to internal latent image emulsion The green absorber 3,3'-diethyl-4,5;4,5-dibenzothiacyanine iodide was incorporated into an internal latent image emulsion just as described in Example 2.

The final emulsion was made by mixing the following:

This emulsion Was employed as a green sensitive emul sion in the manner described in Example 1. The image sharpness benefits were derived in part from the narrow absorption at 494 millimicrons.

It will be apparent that 'the above representative marrow-band red or green absorbers can be incorporated separately or in admixture in the red or green-sensitive emulsions of the color films described. However, as indicated above, it is preferred to incorporate a red absorber in the red-sensitive cyan-forming, coupler-containing emulsion layer overlying the blue-sensitive emulsion layer and thereover a green absorber in a green-sensitive emulsion layer containing magenta-forming coupler.

The multilayer material in which our internal image emulsions having adsorbed optical sensitizing dyes are incorporated may have the sensitive emulsions arranged in any order, that is, with the blue-sensitive emulsion nearest the support or with the green-sensitive or red-sensitive emulsion nearest the support. The internal image emulsion having adsorbed optical sensitizing dye may be in any of these emulsion layers or in an interlayer between emulsion layers, or in an under layer between the support and the emulsion layers, or in a backing layer or overcoating layer. Black and white single-emulsion-l ayer films may also have the internal image absorbing layer as an overcoat, undercoat or backing layer.

What we claim is:

l. A multilayer photographic element comprising 7 a support having on one side thereof three silver halide emulsion layers separately sensitive to the blue, green and red spectral regions, and each containing non-diffusing color-forming compounds capable of coupling with the oxidation product of a primary aromatic amino silver halide developing agent to form dyes, and in at least one layer on said side of the support an internal latent image silver halide emulsion, the silver halide grains of which are such as to cause a test portion of said latter emulsion upon exposure to a light intensity scale for a fixed time between 1 and 1 second and development for} minutes at 20 C. in the following internal type developer:

Water to =1 liter to give a maximum density at least 5 times the maximum density obtained when the equally exposed silver halide emulsion is developed for 4 minutes at 20 C. in the following surface developer:

Grams p-Hy droxyphenylglycine Sodium carbonate 100 Water to 1 liter. 1

to which emulsion layer is adsorbed a dye absorbing a major amount up to 100% of the light to which any emulsion above the colored layer is sensitive and substantially no light to which an emulsion layer below the dyed emulsion layer is sensitive, and when present in an em-ulsion layer, the dye adsorbing a major amount up to 75% of the light to which said last-mentioned emulsion layer is sensitive, said blue, green and red-sensitive emulsions being of theordinary type developable in a surface developer and incapable of development to said density difference under said' test conditions.

2. A multilayer photographic element comprising a support having on one side thereof three silver halide emulsion layers separately sensitive to the blue, green and red spectral regions and each containing non-diffusing color forming compounds capable of coupling with the oxidation 'product'of a primary aromatic amino silver halide developing agent to form dyes, said blue-sensitive emulsion layer being adjacentsaid support and having an appreciably higher blue speed than said green-sensitive and red-sensitive emulsions, and in at least one layeron said side of the support an internal latent image silver halide emulsion'th'e silver halide grains of which are such as to cause a test portion of said latter emulsion upon exposure to a light intensity scale for a fixed time between and 1 second and development for 3 minutes at 20 C. in the following internal type developer: 7

Grams Hydroquinone 15 Monomethyl-p-aminophenol sulfate '15 Anhydrous sodium sulfite Q. 50 Potassium bromide 10 Sodium hydroxide 25 Sodium thiosulfate 20 Water to 1 liter I to give a maximum density at least 5 times the density obtained when the equally exposed silver halide, emulsion is developed for 4 minutes at 20 C. in the following surface developer:

Grams p-Hydroxyphenylglycine 10 Sodium carbonate 100 Water to 1 liter to which is adsorbed a dye absorbing a major amount of visible light to which one of said green-sensitive and red-sensitive emulsion layers is sensitive and a minor amount of blue light. V v

3. A multilayer photographic element comprising a support having on one side thereof three integrally united silver halide emulsion layers separately sensitive to the blue, green and red spectral regions and each containing non-difiu'sing' color-forming compounds capable ofcourpling with the oxidation product of a primary aromatic amino silver halide developing agent to form dyes, said' blue-sensitive emulsion layer being adjacentsaid support and having an appreciably higher blue speed than said green-sensitive and red-sensitive emulsions, and in at least one of said emulsionlayers other than the blue-sensitive emulsion layer an internal latent image silver halide em'ule sion the silver halide grains of which are such as to cause a test portion of said latter emulsion upon exposure to.

a light intensity scale for a fixed time between A0 and 1 second and development for 3 minutes at 20 C in the following internal type developer:

Water to 1 liter V to give a maximum density at least 5 times the maximum density obtained when the equally exposed silver'halide emulsion is developed for 4 minutes at 20 C. in the following surface developer:

p-Hydroxyphenylglycine l0 Sodium carbonate 100 Water to 1 liter to which is adsorbed a dye absorbing a major amount of visible light to which one of said een-sensitive and red-' sensitive emulsion layers is sensitive and a minor amount of blue light.

4. The photographic element of claim 3 wherein the three emulsion layers on the support are sensitized; in order to the blue, red and green spectral regions.

5. A multilayer photographic element comprising a;

support having on one side thereof three integrally united silver halide emulsion layers separately sensitive to the' blue, green and red spectral regions and each containing Grams non-difiusing color-forming compounds capable of coupling with the oxidation product of a primary aromatic amino silver halide developing agent to form dyes, said blue-sensitive emulsion layer being adjacent said support and having an appreciably higher blue speed than said green-sensitive and red-sensitive emulsions, and in said red-sensitive emulsion layer an internal latent image silver halide emulsion the silver halide grains of which are such as to cause a test portion of said latter emulsion upon exposure to a light intensity scale for a fixed time between and 1 second and development for 3 minutes at 20 C. in the following internal type developer:

Grams Hydroquinone l Monomethyl-p-aminophenol sulfate 15 Anhydrous sodium sulfite 50 Potassium bromide Sodium hydroxide 25 Sodium thiosulfate 20 Water to 1 liter to give a maximum density at least 5 times the maximum density obtained when the equally exposed silver halide emulsion is developed for 4 minutes at 20 C. in the following surface developer:

I I Grams p-Hydroxyphenylglycine 10 Sodium carbonate 100 Water to 1 liter to which is adsorbed a dye absorbing a major amount of red light, and in said green-sensitive emulsion layer said internal latent image silver halide emulsion to which is adsorbed a dye absorbing a major amount of green light.

6. The photographic element of claim 5 wherein the red-sensitive layer is superposed over the blue-sensitive emulsion layer and the green-sensitive emulsion layer is outermost.

7. A multilayer photographic element comprising a support having on one side thereof three integrally united silver halide emulsion layers separately sensitive to the blue, green and red spectral regions and each containing nondifiusing color-forming compounds capable of conpling with the oxidation product of a primary aromatic amino silver halide developing agent to form dyes, said blue-sensitive emulsion layer being adjacent said support and having an appreciably higher blue speed than said green-sensitive and red-sensitive emulsions, and in an interlayer between said blue sensitive emulsion layer and the outermost emulsion layer an internal latent image silver halide emulsion the silver halide grains of which are such as to cause a test portion of said latter emulsion upon exposure to a light intensity scale for a fixed time between i and 1 second and development for 3 minutes at 20 C. in the following internal type developer:

Water to 1 liter to give a maximum density at least 5 times the maximum density obtained when the equally exposed silver halide emulsion is developed for 4 minutes at 20 C. in the following surface developer:

Grams p-Hydroxyphenylglycine 10 Sodium carbonate Water to 1 liter to which is absorbed a dye absorbing a major amount of visible light to which one of said green and red-sensitive emulsion layers is sensitive and a minor amount of blue light.

References Cited in the file of this patent UNITED STATES PATENTS 1,879,806 Kelley Sept. 27, 1932 2,456,954 Knott et 'al Dec. 21, 1948 2,456,956 Knott et al Dec. 21, 1948

Claims

1. A MULTILAYER PHOTOGRAPHIC ELEMENT COMPRISING A SUPPORT HAVING ON ONE SIDE THEREOF THREE SILVER HALIDE EMULSION LAYERS SEPARATELY SENSITIVE TO THE BLUE, GREEN AND RED SEPECTRAL REGIONS, AND EACH CONTAINING NON-DIFFUSING COLOR-FORMING COMPOUNDS CAPABLE OF COUPLING WITH THE OXIDATION PRODUCT OF A PRIMARY AROMATIC AMINO SILVER HALIDE DEVELOPING AGENT TO FORM DYES, AND IN AT LEAST ONE LAYER ON SAID SIDE OF THE SUPPORT AN INTERNAL LATENT IMAGE SILVER HALIDE EMULSION, THE SILVER HALIDE GRAINS OF WHICH ARE SUCH AS TO CAUSE A TEST PORTION OF SAID LATTER EMULSION UPON EXPOSURE TO A LIGHT INTENSITY SCALE FOR A FIXED TIME BETWEEN 1/100 AND 1 SECOND AND DEVELOPMENT FOR 3 MINUTES AT 20*C. IN THE FOLLOWING INTERNAL TYPE DEVELOPER: