JPS5845016B2 - Paper thin film unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a novel and improved additive color process.
ive color process) photographic film unit.

additive color photography
(photography) involves the exposure of a light-sensitive silver halide layer through an optical screen element or network containing a filter or screen element that selectively transmits a predetermined portion of the electromagnetic radiation that is projected onto the screen. do.

As a result of the treatment of the silver halide layer exposed in this way, during the projection of the image thus recorded, a specific division of the filter elements to adjust the amount of light passing through a given screen element Behind the area, silver deposition occurs as a function of the degree of exposure.

In an additive screen unit, the photosensitive material and the additive screen can consist of separate and different elements suitably recorded during exposure and during viewing or projection of the image.

Thus, following the first exposure of the photoresponsive material, this screen can be removed to allow processing and formation of the silver image, and then the silver image thus formed can be viewed through the resulting image. can be combined again.

However, it is desirable that the additive screen and the photoresponsive material be permanently placed together.

In such permanent arrangements, the screen may, of course, be protected from deterioration or alteration by the action of processing compositions applied to the photoresponsive material to develop the recorded image, for example by barrier elements or interlayers. It is necessary to insulate.

In general, a suitable film combination consists of a panchromatically sensitive silver halide layer and a multicolor additive screen.

As an example of such a configuration, one may cite the Dufay color film units, which also include the Focal Press
Published by Friedman (194
4th grade), “The History of Color Photography” (The Histor
y of Co1or Photo.

-graphy”).

A variety of conventional photosensitive layers can be used in additive film units depending on the particular type of processing to be used.

For example, depending on the particular photosensitive layer selected, a direct negative image and a direct positive image can be formed by reversal techniques; by the use of conventional direct positive emulsions; by processes such as silver diffusion transfer; or by forming a separate positive image. can be directly imaged by formation in another layer of the film unit, which is then used with a screen similar to, or substantially identical to, that used for exposure of the film unit with front and back recording surfaces ( registration
).

A preferred film unit uses an image-receiving element between the light-sensitive silver halide layer and an additive multicolor screen.

In such film units, exposure of the silver halide emulsion is completed through a screen unit and an image receiving element.

Subsequent processing results in the formation of a positive silver image in the next adjacent image receiving component of the additive multicolor screen.

The film unit is an example of a structure that prevents registration problems.

This is because the screen used for exposure and the positive silver image for fluoroscopy are visually on the same side.

In the film unit, the silver halide layer is removed or left in place after positive silver imaging.

Examples of suitable film structures containing negative and positive images that are superimposed and formed by a diffusion transfer process include U.S. Pat. No. 2,861,885;
No. 26454; No. 2,944,894; No. 3,536
, 488; and also U.S. Pat. No. 3,615,427.
No. 3,615,428; No. 3,615,429; and No. 3,615,426.

The use of a film unit in which the silver halide layer remains an integral part of the film unit after formation of a positive image, as an image-receiving element, can be compared to negative silver developed in the silver halide layer. particularly high covering power
This is accomplished by using a layer that provides an unusually effective silver precipitation environment in which to cause silver precipitation to occur.

For further discussion of such developments, see Nidwin.
Edwin H. Land, "One-Step Photography Method", Photographic Journal, Chapter A, pp. 7-15, January 1950 (Edwin H. Land, Qne St.
epphotography, photography
c Journal.

5ection A, oages 7-15. Jan
See Uary, 1950).

The integrated film units mentioned above, particularly those in the above US patent specification, are suitable for use in motion picture films for motion picture projection, such as US Pat.
It is particularly desirable for use as a motion picture film system such as that described in , No. 127.

Processing of such film units, as well as specific compositions of processing compositions, are described in detail in the aforementioned patent specifications.

However, additive photography is not currently widely used for B.%.

This lack of widespread adoption and use is due to a number of factors, not least of which is that visual and sensitometric observations of additive film units are difficult to detect in particularly heavily exposed areas. is believed to exhibit less than a sufficient degree of color saturation.

Additionally, color desaturation as evidenced by the presence of false or negative colors
also received attention.

According to the present invention, an additive multicolor screen is provided with a photosensitive silver halide layer and an antihalation layer adjacent to said silver halide layer and placed on the side of the silver halide layer opposite to the additive multicolor screen. Excellent results are achieved with the use of a projection additive multicolor film unit comprising layers.

The use of an antihalation layer consists in preventing actinic radiation transmitted through the silver halide layer from being reflected or scattered back into the silver halide layer, thereby providing a wide range of color separation, especially in the region of the characteristic curve. .

FIG. 1 is an enlarged cross-sectional view of a preferred film unit within the scope of the present invention.

FIG. 2 is an enlarged cross-sectional view of another construction of a film unit within the scope of the present invention.

FIG. 3 is an explanatory diagram of the red column characteristic curve of a control film unit.

FIG. 4 is an explanatory diagram of the characteristic curve of the red column of the film unit of the present invention.

In the present invention, by using an antihalation layer on the side of the photosensitive layer opposite the screen, adjacent to the photosensitive silver halide layer, the reflection or back scattering of light passing through the photosensitive layer is substantially reduced. It was discovered that it could be made to disappear.

Absorption of the transmitted light is caused by the absorption of halides other than the silver halide grains that are within the normal path of the incident radiation, i.e. directly behind the relevant portion of the filter element through which the original ray of the incident light passes. Eliminate exposure of silver particles.

The present invention contemplates the use of an antihalation layer with any of the additive films described above.

However, while such a film unit describes a light-sensitive silver halide layer and a layer that is additional to the additive screen, the antihalation layer may not be present in the light-sensitive layer or from other layers used in the film unit. Regardless of the position of the layer, it must be placed adjacent to the side of the silver halide layer opposite the screen.

The additive color images obtained by the present invention exhibit significantly improved saturation and color fidelity.

As mentioned above, known film units tend to exhibit even more desaturated color to areas where "white" appears instead of color, especially in heavily exposed areas.

Furthermore, attention has been drawn to cases in which color distortions are evidenced by the appearance of pseudo or so-called negative colors.

The above-mentioned disadvantageous effect, which has been noticed in film units of the prior art, is that light transmitted through the silver halide emulsion layer
The light can then be reflected at an angle to its original path and returned to the silver halide layer'\.

This reflected light exposes silver halide grains located laterally away from the axis of the exposure light beam that first entered the surface of the silver halide emulsion layer.

The exposed silver halide grains will thus be behind the filter elements of the additive screen of a different color than the one through which the light originally passed.

The effect of such exposure is the aforementioned loss of color saturation and color fidelity noted above.

The problem of loss of color saturation is particularly critical when using film units having very thin silver halide layers, especially those containing less than about 200 silver per square feed.

The less silver halide there is to absorb light incident on the film unit surface, the more light will pass through the silver halide layer and be reflected back.

As used herein, the term "antihalation" (ant
ihalation) is intended with respect to the prevention of said phenomenon, ie, the reflection of light back into the emulsion layer from the interface between the emulsion layer and the atmosphere or other layers.

Any light absorbing agent can be used in the practice of this invention, including both dyes and pigments as desirable materials.

In a preferred embodiment, said back scattering is obviated by the use of a layer containing antihalation dye(s) on the side of the light-sensitive silver halide layer remote from the screen.

However, since the film unit of the present invention is primarily a projection film, subsequent exposure and observation of the photosensitive layer is required to avoid unwanted light absorption and to maintain the fidelity of color reproduction during projection. The antihalation layer previously provides virtually no absorption.

In a desirable embodiment, antihalation dye(s) are disposed in the treatment composition transparent layer to eliminate light absorption ability.

That is, by the action of the treatment composition, by a separate treatment subsequent to the application of the treatment composition, or by the application of heat or light, this layer is rendered non-absorbing.

Alternatively, the antihalation layer can be separated from the film unit and discarded following exposure, for example before, during or after processing.

Such separation can be accomplished by peeling or dissolving this layer, or by eluting specific light-absorbing materials from this layer.

Separation is particularly suitable when the light-absorbing material is not soluble in the processing composition, such as a light-absorbing metallic material containing pigments such as carbon black, or light-absorbing crystalline salts thereof.

However, as mentioned above, when an antihalation dye is used in a layer that is permeable to the processing composition, the dye has the desired degree of light absorption capability during exposure of the film unit, while being transparent to the antihalation layer during processing. It is desirable that the treatment composition be discharged upon contact with the treating composition.

In said method, the film unit of the present invention, which is an integral structure, in which the emulsion is maintained in superimposition with a positive silver image and an additive multicolor screen after exposure and positive imaging, is processed by a diffusion transfer reversal method. It is preferable.

A particularly preferred film unit employs a separate positive silver image-receiving layer between the light-sensitive silver halide emulsion and the additive multicolor screen.

Additive multicolor screens preferably use fine filter elements to allow the photographic system to obtain the maximum degree of resolution.

High resolution is particularly desirable in projection systems, since the lack of resolution limits the extent of magnification of the projected image.

In the present invention, an additive polychrome screen having about 3000 filter elements or lines per inch, or trichromatic screen terminology, about 1000 triplets per inch is used.
riplet) screen can be used.

Such a trichromatic screen includes a set of filter elements with a blue primary color and a set of filter elements with a green primary color arranged in a repeating distribution in adjoining relation in substantially a single plane. A plurality of geometrically repeating light filtering colored elements is used, including a filter element and a set of red primary colored filter elements.

As the number of filter elements per inch increases, the area of each given element decreases, resulting in the screen grating in increasing diffraction of actinic radiation incident on a given element. functions.

This diffracted light will not be absorbed at all by a silver halide crystal placed directly behind a given filter element.

As mentioned above, this is especially true in silver halide emulsions with relatively low silver contents.

Unabsorbed light passing through the silver halide emulsion layer can be reflected or scattered back from the surface behind the silver halide emulsion layer due to the refractive index difference between the light-sensitive layer and the next adjacent layer. This may result in exposure of the silver halide crystals behind adjacent filter elements of the color screen.

Thus, the use of the antihalation layer of the present invention aids in the construction of additive screen elements with relatively low silver content to provide superior projected surface images with high saturation.

Antihalation dyes suitable for use in the practice of this invention are well known to operators.

Representative antihalation dyes that can be used in the present invention are U.S. Pat.
No. 69,985, No. 3,440,051, No. 3,38
No. 9,994, No. 3,384,487.

No. 3,364,029, No. 3,352,680, No. 3,340,062, No. 3,005,701, and British Patent No. 515,988. .

Oxonol and triarylmethane dyes are particularly suitable for the present invention.

However, by dispersing such dyes in a polymeric material that is permeable to the processing composition, it initially possesses the light absorption capacity and at the same time renders the processing composition for image development antihalation. It has not heretofore been known to provide an antihalation layer that can be passed through the layer.

In addition to placing the dye in the transparent layer of the processing composition, either in solution or as a dispersion, it is also possible to coat the dye directly onto the photosensitive layer without the use of a polymeric carrier. can.

However, care must be taken to avoid the introduction of any light-absorbing materials into the silver halide emulsion layer that may adversely affect the photographic sensitivity of the emulsion.

Alternatively, the dye can be dispersed in a layer suitable for removal from the film unit after exposure and before projection of the image.

If the antihalation layer is to be retained as part of the film unit, the dye must be bleached to a substantially colorless state after exposure, preferably by the action of a processing composition.

The dye should also be relatively immobile within the film unit.

Examples of suitable dyes for use in the present invention include:

The dyes mentioned above can also be used as salts, for example silver salts.

The optical absorption of the antihalation layer can be varied over a relatively wide range depending on the effectiveness of absorption desired and the amount of absorption required for a given silver halide emulsion layer'.

The antihalation layer has a transmission density of about 0.4 to 1.4, preferably greater than 0.6.
on density).

Thus, when used in a stacked relationship with multiple film units during exposure, the antihalation layer has sufficient density (light absorption capacity) to substantially prevent reflection and prevent exposure of underlying film units. It is desirable to use it so that it has.

It has been found that the amount of light absorber required to provide the desired transmission density and absorption properties is relatively low.

For example, satisfactory film units have been obtained using about 10 m@9 of dye per square foot.

Conversely, it has also been found that when relatively high levels of dye are used and contacted with a treatment composition that penetrates the antihalation layer, the dye is quickly and completely removed.

Although the polymer material that supports the light-absorbing material is not limited, it is desirable that the polymer used allows the treatment composition to pass therethrough.

Suitable polymeric materials include ethylcellulose, cellulose acetate-hydrodiene phthalate, polyvinyl alcohol, polyvinylpyrrolidone and gelatin.

Now referring to a drawing, FIG. 1 shows a number of red primary filter elements, a number of green primary filter elements arranged in a geometrically repeating distribution in adjoining relation in substantially a single plane. an additive multicolor screen 11 consisting of a plurality of primary blue filter elements, a substantially non-light-sensitive layer 13 carrying nuclei for silver precipitation, a light-sensitive layer 12 containing silver halide crystals and one or more 1 is an enlarged cross-sectional view of a uniform film unit within the scope of the present invention comprising a transparent film substrate or support 10 overlaid with a layer 14 containing an additional antihalation dye; FIG.

FIG. 2 shows that the film unit includes, in order, an additive polychrome screen 11, a substantially non-light-sensitive layer 13 carrying silver precipitation nuclei, a light-sensitive layer 12 containing silver halide crystals, and a desorption layer. Another embodiment of the invention is described which comprises a transparent support member 10 on the first side of a layer 15 and a light absorbing layer 16 containing carbon black.

The film unit depicted in FIG. 2 includes layers 15 and 16 from the film unit following exposure of photosensitive layer 12
is expected to leave.

Therefore, in this embodiment, there is no need for the selected light absorber to be expelled or rendered substantially transparent by the action of the treatment composition.

This is because the layer 16 to be treated with light absorbers is separate from the film unit carrying the positive silver image during projection.

Stripping layer 15 can be comprised of conventional materials well known in the photographic art and can be easily removed by the action of processing compositions to permit easy removal of layers 15 and 16 by suitable chemical or mechanical action. Preferably, no tackiness is imparted.

As will be readily appreciated, additional layers can optionally be included in the film unit, such as, for example, separate layers carrying processing reagents, barrier layers, protective layers, support layers, and the like.

It should be understood that in cases where the dye has a desensitizing effect with respect to the silver halide layer agent, appropriate precautions should be taken to prevent contact, for example by using suitable insulating layers.

In the practice of this invention, silver precipitation nuclei can be disposed within the light-sensitive silver halide layer of the film unit combination in a separate layer or layers adjacent to one or both sides of the /'% silver halide layer. , and the silver halide layer can also consist of two or more silver halide layers, each optionally carrying a silver precipitate nucleus, and another silver halide layer located between the separate silver halide layers. A nuclear layer can be included.

The types and amounts of silver precipitation nuclei suitable for use in the present invention are described in the aforementioned patent specifications, particularly in the aforementioned U.S. Pat. No. 3,615,42.
No. 7, No. 3,615,428, No. 3,615,429
No. 3,615,426.

Silver halide emulsions suitable for use in the present invention are described in the aforementioned patent specifications.

A particularly useful silver halide emulsion is Vivian, whose original application number (Applicant Case No. 4859) was filed at the same time as this application.
Vivian K. Walworth
h) is a substituted halide-silver halide emulsion described in the co-filed application.

The manufacture of color screens can be accomplished by any conventional method known in the art.

A preferred method of screen manufacturing is described in U.S. Patent No. 3,032.
, No. 008, No. 3,229,607 and No. 3,31
No. 8,220.

The support or film substrate may be any of various types of transparent rigid or flexible supports such as glass, synthetic types and polymers derived from natural products.

Particularly suitable materials are polymethacrylic acid, methyl and ethyl esters, vinyl chloride polymers, polyamides such as nylon, polyesters such as polymeric films derived from ethylene glycol, terephthalic acid, cellulose. Polymers, derivatives such as cellulose acetate, cellulose nitrate, cellulose triacetate, cellulose propionate, cellulose butyrate, cellulose-acid butyrate or cellulose acetate propionate, flexible transparent synthetic polymers such as polycarbonate, polystyrene, etc. Consists of merging.

The following examples illustrate the invention in more detail but do not limit it.

Example A film unit is manufactured according to the method described above.

This is an approximately 3000 lines per inch additive screen consisting of a set of red primary filter screen elements, a set of blue primary filter screen elements and a set of green primary filter screen elements in repeating adjacent relationship; Acetate butyrate protective coating layer; a composition comprising deacylated chitin and cupric sulfide containing about 4.4 inches of deacylated chitin per square foot and 0.25 inches of cupric sulfide per square foot; 1 Approximately 1507 Q gelatin per square foot and 100 Q silver per square foot
a fully color sensitive hardened gelatin silver iodochlorobromide emulsion coated with and containing 7.41 n9 of propylene glycol alginate per square foot and 2.9 inches of sodium dioctyl sulfosuccinate per square foot; and cellulose. 10 ml solution of acetate hydrogen phthalate 4
．． Dye number 7 dissolved in 5 cc and acetone gee
0.85p of dye number 8, 0.050g of dye number 1
It consisted of a polyester film substrate carrying on one side a layer of 0.150 g of 1.

The film unit and a control film unit that differed from the film unit only in the absence of an antihalation layer were exposed in the same manner as for a conventional step wedge, and the film unit was exposed to about 6
0 seconds, 111 cc of water 4 triaminophenol 0.36
g, hydroxyethyl cellulose 6.1, caustic soda 6.2 g, sodium thiosulfate 16 g, sodium sulfite 6.4
Developed by contacting with a processing composition consisting of 0.42 g of 8,916-nitrobenzimidazole, 7 g of a surfactant (reaction product of nonylphenol and glycidol), and 5 g of tolylhydroquinone.

During processing the dye in the antihalation layer was rendered substantially non-absorbent.

Figures 3 and 4 illustrate the values obtained by analysis of the red column of the film unit with an analytical color densitometer.

From a comparison of the curves, it may be noted that the film unit containing the antihalation layer (Figure 4) exhibits better color separation and therefore greater red purity or color saturation than the JW (Figure 3). .

Comparison of the toes of the respective curves shows that the negative color evident in the areas of maximum exposure of the control film unit virtually disappears in the film unit of the invention.

Additionally, color saturation and purity are maintained over a wider exposure range in the film unit of the present invention.

The silver bromide emulsion that can be advantageously used in the present invention is disclosed in Nidwin H. Rand (Edw.
The present invention is a very uniform grain size silver halide emulsion of the type anticipated in US Pat. No. 3,894,871 by H.

Such silver halide emulsions have an average grain size within the range of 0.7 to 1.5 microns and at least 90% of the silver halide grains have a diameter within ±30% of said average size. It is preferable to have.

This silver halide emulsion contains about 90 to 150 q/ft of silver.
It is preferred to coat to give a silver content of F.

The present invention is an additive color photographic film unit as claimed, and includes the following embodiments.

(1) The film unit according to claim 1, wherein the antihalation layer is permeable to a treatment composition.

(2) The film unit according to claim 1, wherein the antihalation layer has a radiation absorbing ability suitable for disappearing at that position.

(3) The film unit according to claim 1, wherein the antihalation layer has a radiation absorbing ability suitable for disappearing by being extracted from the film unit.

(4) Photosensitive silver halide layer is approximately 200m9s7ft2
A film unit as claimed in claim 1 having a silver content not greater than .

(5) The film unit according to claim 1, wherein the antihalation layer has an optical transmission density of 0.4 or more.

(6) The film unit according to item 5, wherein the antihalation layer has an optical transmission density in the range of 0.4 to 1.4.

7. The film unit of claim 5, wherein the antihalation layer has a density sufficient to substantially block the path of light therethrough during exposure.

(8) The film unit according to claim 1, wherein the antihalation layer contains a dye.

9. A film unit according to claim 8, wherein the dye is suitable for rendering substantially non-absorbing radiation in the visible range of the electromagnetic spectrum upon contact with the photographic processing composition.

(10) A film unit according to claim 1, in which the photosensitive layer comprises a direct positive emulsion.

(11) Patent claims suitable for processing by inversion processing (
7) The film unit described in Range 1.

02) A film unit according to claim 1, which is suitable for processing by silver diffusion transfer treatment.

(13) comprising, in order, an additive polychrome screen; a layer comprising photosensitive silver halide and having a silver precipitating layer incorporated therein; and an antihalation layer, the antihalation layer being a film; 13. A film unit according to claim 12, which is suitable for being erased following exposure of the unit.

04) Thirteenth, consisting in that the screen is a trichrome screen with red, blue and edge optical filter elements
The film unit described in section.

05) Permanently fixed laminate and additive process screen/photosensitive layer consisting of photosensitive silver halide crystals and combined with silver precipitation nuclei; and irradiating actinic radiation to the photosensitive silver halide crystals. an antihalation layer containing a dye at a concentration effective to absorb and thereby prevent radiation from passing through the photosensitive layer and impinging on the interface of the layer on the opposite side of the screen; comprising a transparent support, said antihalation layer being disposed next adjacent said emulsion layer on the opposite side of the screen, and said silver precipitation nuclei being exposed to light in the presence of a silver halide solvent for development. as effective to give a silver image derived from the development of exposed silver halide crystals possessing a maximum density that is substantially less than the maximum density of the silver image derived from the development of unexposed silver halide crystals. 14. wherein the dye is present in a concentration of about 100%, and wherein the dye is suitable for rendering the film unit substantially non-absorbing by contacting it with a processing composition suitable for developing the film unit. film unit.

06) The film unit according to item 15, wherein the silver precipitation nuclei are arranged in a separate layer adjacent to the photosensitive layer.

(17) The film unit according to item 16 (d), wherein the photosensitive silver halide crystals are selected from the group consisting of fully orthochromically sensitive silver chlorobromide, iodochloride, iodobromide and iodochloride bromide crystals.

08) The film unit according to item 15, wherein the silver precipitation nucleus is selected from the group consisting of metal sulfides, metal selenides and colloidal noble metals.

09) The method according to claim 2, wherein the transmission density of the antihalation layer is 0.4 or more during exposure of the film unit.

(20) The first antihalation layer has a transmission density range of 0.4 to 1.0 during exposure of the film unit.
The method described in Section 9.

21. The method of claim 2, wherein the radiation absorption capacity of the antihalation layer disappears as a function of contact between the layer and the treating composition.

(22) The radiation-absorbing capacity of the antihalation layer is abolished by removal of the layer from the film unit, and includes a step of removing the layer from the film unit subsequent to exposure of the unit. The method described in Section 2.

(23) The photosensitive silver halide layer is about 200cm/ft
2. A method as claimed in claim 2, comprising no more than 2 silver.

(24) The method according to claim 2, wherein the antihalation layer contains a dye.

25. The method of claim 24, wherein: (a) the dye is suitable for providing substantial non-absorption of visible radiation upon contact with a treatment composition.

(26) The method according to claim 2, wherein the silver halide layer comprises a direct positive silver halide emulsion.

(27) The photosensitive silver halide layer contains silver precipitation nuclei, the processing composition contains a silver halide developer and a silver halide solvent, and the positive silver image is formed by a diffusion transfer technique to form silver precipitation nuclei. A method as claimed in claim 2 by being given adjacent.

(28) (a) A photographic film unit comprising an additive color screen, a nucleus for silver precipitation, a layer containing photosensitive silver halide, and an antihalation layer, the antihalation layer comprising a multicolor screen and a photosensitive layer. having an actinic radiation absorption capacity suitable for preventing substantial reflection back into the silver halide layer of radiation transmitted through the silver halide layer, the antihalation layer being located on the side of the silver halide layer opposite the screen; (b) contacting the exposed element with a processing composition comprising a silver halide solvent and a silver halide developer;
thereby imparting to the element a visible silver image in the plane of the unexposed areas of the silver halide layer as a function of the point-to-point degree of its exposure; and (c) eliminating the radiation absorption capacity of the antihalation layer. A method according to claim 2, comprising a combination of steps.

(29) The method limited to item 28, wherein the color screen is a three-primary additive color multicolor screen consisting of red and blue optical filter elements in the screen pattern.

(30) The method according to item 28, in which the photosensitive silver halide crystal is selected from the group consisting of fully colorimetric photosensitive silver chlorobromide, silver iodochloride, silver iodobromide, and silver iodochlorobromide crystal.

(31) The method according to item 28, in which the silver precipitation nucleus is selected from the group consisting of metal sulfides, metal selenides, and colloidal noble metals.

[Brief explanation of drawings]

1 and 2 are enlarged sectional views of an example of the film unit of the present invention, and FIGS. 3 and 4 are explanatory diagrams of the characteristic curves of the red column of the control film unit and the film unit of the present invention. 1 and 2, 10 is a film substrate (support), 11 is an additive multicolor screen, 12 is a photosensitive layer, 13 is a non-photosensitive layer containing nuclei for silver precipitation, and 14 is a halation layer. A layer containing a protective dye, 15 a desorption layer, and 16 a light absorption layer containing carbon black.

Claims (1)

[Scope of Claims] 1 permanently fixed laminate and in order: (1
) an additive color screen, (11) a layer containing silver precipitation nuclei, a photosensitive silver halide layer containing silver with a coverage of not more than about 200 mg/ft2 of silver, and (IV) a photosensitive silver halide layer containing silver precipitation nuclei; Approximately 0.4~ by absorbing visible radiation that is active in silver
at least one at a concentration effective to provide an optical transmission density of 1.4, thereby preventing the opposition of radiation passing through the photosensitive layer and impinging on the surface of the photosensitive layer opposite the screen. a transparent support carrying on one side an antihalation layer containing a dye, the antihalation layer being disposed adjacent to the photosensitive layer on the side opposite the screen, and the dye containing a , disposed in a processing composition permeable layer and bleachable to said radiation-non-absorbing substantially colorless state upon contact with an alkaline processing composition suitable for developing the film unit; An additive color diffusion transfer photographic film unit adapted to be.