Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
  • G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
  • G03C7/3029—Materials characterised by a specific arrangement of layers, e.g. unit layers, or layers having a specific function
• • 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
  • G03C7/32—Colour coupling substances
  • G03C7/3225—Combination of couplers of different kinds, e.g. yellow and magenta couplers in a same layer or in different layers of the photographic material

Definitions

• This invention relates to a photographic material having multiple color layers comprising a unit of a number of green sensitive silver halide emulsion layers containing at least one magenta image dye-forming coupler and a bleach accelerating coupler.
• Color photographic materials comprising multiple layers containing photographic couplers are well known. Typical photographic materials are described in US-A-4,145,219; 4,724,198; 4,184,876; 4,186,016 and 4,724,198.
• the present invention solves these types of problems by providing a multilayer color photographic element in accordance with claims 1, 7 and 12.
• the invention provides a multilayer color photographic element comprising a support having coared thereon photographic silver halide emulsion layers, the layers including a unit of at least three green sensitive silver halide emulsion layers having a first green sensitive layer being more sensitive than a second or mid green sensitive layer which is more sensitive than a third green sensitive layer, the green sensitive layers being adjacent and the unit containing a masking coupler.
• the first green sensitive layer is comprised of at least one magenta image dye-forming coupler (A), a timed development inhibitor releasing coupler, and preferably a non-rimed development inhibitor releasing coupler.
• the second layer is comprised of at least one first magenta image dye-forming coupler, (A), preferably at least one second magenta image dye-forming coupler, a development inhibitor releasing coupler and preferably a cyan dye-forming coupler.
• the third layer is comprised of at least one magenta image dye-forming coupler which is also a bleach accelerating releasing coupler. Further, the third layer contains a development inhibitor releasing coupler.
• the present invention provides improved photographic properties such as color rendition, granularity, bleaching and reduced manufacturing costs.
• the Barc coupler provides the majority of the image dye in the slow record and may suitably provide 75% or more. It may be suitable to rely entirely on the Barc coupler for dye formation in the third or slow layer.
• a preferred photographic element in accordance with the invention typically comprises the following layer order:
• the overcoat layer can be comprised of components known in the photographic art for overcoat layers including UV absorbers, matting agents, surfactants, and like.
• a UV layer can also be used which contains similar materials.
• UV absorbing dyes useful in this layer and the antihalation layer have the structure:
• This layer also can contain dyes which can help in adjusting the photographic sensitivity of the element.
• dyes can be a green filter dye.
• a suitable green filter dye has the structure
• a suitable red filter dye has the structure
• dyes that may be used include washout dyes of the type referred to herein and filter dyes that decolorize during the photographic process.
• the image dye-forming couplers in the blue-sensitive, green-sensitive and red sensitive layers as described can be any of the image dye-forming couplers known in the photographic art for such layers for forming yellow, magenta and cyan dye images.
• Such couplers can comprise a coupler moiety (COUP) known in the art and as described.
• COUP coupler moiety
• Combinations of the image dye-forming couplers can be useful in the described photographic silver halide emulsion layers.
• Couplers that are yellow dye forming couplers are typically acylacetamides, such as benzoylacetanilides and pivalylacetanilides.
• acylacetamides such as benzoylacetanilides and pivalylacetanilides.
• Such couplers are described in such representative patents and publications as: US-A-2,875,057; 2,407,210; 3,265,506; 2,298,443; 3,048,194; 4,022,620; 4,443,536; 3,447,928 and "Farbkuppler: Eine Literaturbersicht", published in Agfa Mitanderen, Band III, pages 112-126 (1961).
• the couplers that are cyan image dye-forming couplers (C) are typically phenols or naphthols, such as described in the photographic art for forming cyan dyes upon oxidative coupling.
• couplers (C) that form cyan dyes are typically phenols and naphthols that are described in such representative patents and publications as: US-A-2,772,162; 3,772,002; 4,526,864; 4,500,635; 4,254,212; 4,296,200; 4,457,559; 2,895,826; 3,002,936; 3,002,836; 3,034,892; 2,474,293; 2,423,730; 2,367,531; 3,041,236; 4,443,536; 4,124,396; 4,775,616; 3,779,763; 4,333,999 and "Farbkuppler: Being Literaturbersicht", published in Agfa Mitanderen, Band III, pages 156-175 (1961).
• couplers (A) that form magenta dyes are typically pyrazolones, pyrazolotriazoles and benzimidazoles, such couplers are described in such representative patents and publications as US-A-2,600,788; 2,369,489; 2,343,703; 2,311,082; 3,824,250; 3,615,502; 4,076,533; 3,152,896; 3,519,429; 3,062,653; 2,908,573; 4,540,654; 4,443,536; 3,935,015; 3,451,820; 4,080,211; 4,215,195; 4,518,687; 4,612,278; and European Applications 284,239; 284,240; 240,852; 177,765 and "Farbkuppler: Being Literaturbersicht", published in Agfa Mitannonen, Band III, pages 126-156 (1961).
• the photographic element may be processed to form a developed image in an exposed color photographic element by developing the element with a color developer.
• the more blue sensitive layer or fast yellow layer contains a timed development inhibitor releasing coupler (DIR).
• the fast yellow layer is a coupler starved layer.
• the layer is preferably free of an image dye-forming coupler.
• coupler starved is meant a condition in the layer in which there is less dye-forming coupler than is theoretically capable of reacting with all of the oxidized developing agent generated at maximum exposure.
• Couplers other than image dye-forming couplers can be present in this layer and such couplers can include, for example, timed development couplers as noted or non-timed DIR couplers and color correcting couplers. These other couplers are typically used at concentrations known in the photographic art and can produce yellow dye typically not more than about 3% of the total density of the yellow record.
• Suitable timed DIR couplers used in the fast yellow layer comprise a DIR coupler (E) that is capable of releasing a mercapto-tetrazole development inhibitor comprising a substituent: characterized in that
• X is alkylene of 1 to 3 carbon atoms and R is alkyl of 1 to 4 carbon atoms, and the sum of the carbon atoms X and R is 5 or less.
• the DIR coupler is typically a pivalylacetanilide coupler, such as described in US-A-4,782,012.
• the timed DIR coupler can be any timed DIR coupler useful in the photographic art which will provide a timed development inhibitor release.
• a development inhibitor releasing coupler containing at least one timing group (T) that enables timing of release of the development inhibitor group can be any development inhibitor releasing coupler containing at least one timing group known in the photographic art.
• the development inhibitor releasing coupler containing at least one timing group is represented by the formula: characterized in that
• COUP is a coupler moiety, as described, typically a cyan, magenta or yellow dye-forming coupler moiety;
• T and T 1 individually are timing groups, typically a timing group as described in US-A-4,248,962 and 4,409,232;
• n 0 or 1
• Q 1 is a releasable development inhibitor group known in the photographic art.
• Q 1 can be selected from the INH group as described.
• Preferred timed DIR couplers of this type are:
• Color from the fast yellow layer is produced mostly as a result of oxidized developer formed in the fast yellow layer migrating to the adjacent slow yellow layer and reacting to form yellow dye.
• couplers that are development inhibitor releasing couplers as described include those described in for example US-A-4,248,962; 3,227,554; 3,384,657; 3,615,506; 3,617,291; 3,733,201; and U.K. 1,450,479.
• Preferred development inhibitors are heterocyclic compounds, such as mercaptotetrazoles, mercaptotriazoles, mercaptooxadiazoles, selenotetrazoles, mercaptobenzothiazoles, selenobenzothiazoles, mercaptobenzoxazoles, selenobenzoxazoles, mercaptobenzimidazoles, selenobenzimidazoles, benzotriazoles, benzodiazoles and 1,2,4-triazoles, tetrazoles, and imidazoles.
• heterocyclic compounds such as mercaptotetrazoles, mercaptotriazoles, mercaptooxadiazoles, selenotetrazoles, mercaptobenzothiazoles, selenobenzothiazoles, mercaptobenzoxazoles, selenobenzoxazoles, mercaptobenzimidazoles, selenobenzimidazoles,
• the less blue sensitive layer or slow yellow layer contains a yellow image dye-forming coupler.
• Such yellow image dye-forming coupler can be any yellow dye-forming coupler useful in the photographic art.
• Couplers that are yellow image dye-forming couplers are typically acylacetamides, such as benzoylacetanilides and pivalylacetanilides, such as described in the photographic art for forming yellow dyes upon oxidative coupling.
• the yellow dye-forming coupler in the slow yellow layer is typically a pivalylacetanilide coupler containing a hydantoin coupling-off group.
• Such a coupler is illustrated by the formula: characterized in that
• Yellow dye-forming couplers suitable for the slow yellow or less sensitive blue layer are:
• a preferred yellow dye-forming coupler for the slow yellow layer has the structure:
• Timed or non-timed DIR couplers as noted with respect to the fast yellow layer may also be used in the slow yellow lower.
• a yellow filter layer is provided between the slow yellow and the fast magenta.
• This layer can comprise Carey Lea silver (CLS), bleach accelerating silver salts, any oxidized developer scavenger known in the photographic art, such as described in US-A-4,923,787, and a dye to enable improved image sharpness or to tailor photographic sensitivity of the element.
• CCS Carey Lea silver
• bleach accelerating silver salts any oxidized developer scavenger known in the photographic art, such as described in US-A-4,923,787
• a dye to enable improved image sharpness or to tailor photographic sensitivity of the element.
• a preferred oxidized developer scavenger is:
• oxidized developer scavenger useful in the invention include:
• an interlayer is provided between the yellow filter and any other layer that contains a dye forming coupler.
• a bleach accelerating silver salt (BASS)
• BASS bleach accelerating silver salt
• This interlayer may contain the oxidized developer scavenger noted above. Further, the interlayer may be contiguous with the yellow filter layer and may be disposed on both sides of the yellow filter layer.
• Representative bleach accelerating silver salts are disclosed in US-A-4,865,965; 4,923,784; 4,163,669. The bleach accelerating silver salts can comprise silver salts of mercapto proprionic acid.
• BARC and BASS compounds may be used in combination in the element.
• filter dyes may be used. When filter dyes are used, then the interlayer contiguous or adjacent the yellow filter layer may be omitted. Oxidized developer scavenger as referred to above may be used in the yellow filter layer with the filter dye. Examples of filter dyes such as washout or decolorizing dyes useful in the present invention are described in US-A-4,923,788 incorporated herein by reference.
• Such filter dyes have the formula: characterized in that R is substituted or unsubstituted alkyl or aryl, X is an electron withdrawing group, R' is substituted or unsubstituted aryl or a substituted or unsubstituted aromatic heterocyclic nucleus, and L, L', and L" are each independently a substituted or unsubstituted methine group.
• Preferred alkyl groups include alkyl of from 1 to 20 carbon atoms, including straight chain alkyls such as methyl, ethyl, propyl, butyl, pentyl, decyl, dodecyl, and soon, branched alkyl groups such as isopropyl, isobutyl, t-butyl, and the like.
• These alkyl groups may be substituted with any of a number of known substituents, such as sulfo, sulfato, sulfonamide, amido, amino, carboxyl, halogen, alkoxy, hydroxy, phenyl, and the like.
• the substituents may be located essentially anywhere on the alkyl group. The possible substituents are not limited to those exemplified, and one skilled in the art could easily choose from a number of substituted alkyl groups that would provide useful compounds according to the formula.
• Preferred aryl groups for R include aryl of from 6 to 10 carbon atoms (e.g., phenyl, naphthyl), which may be substituted.
• Useful substituents for the aryl group include any of a number of known substituents for aryl groups, such as sulfo, sulfato, sulfonamido (e.g., butane-sulfonamido), amido, amino, carboxyl, halogen, alkoxy, hydroxy, acyl, phenyl, alkyl, and the like.
• the filter dyes may be used in combination with the finely divided silver.
• permanent yellow filter dyes can be used instead of CLS or washout-filter dyes, such permanent dyes, for example, have structures:
• a decolorizing microcrystalline dye useful in the invention has the structure:
• the most green sensitive layer or fast magenta layer comprises a magenta image dye-forming coupler (A), a timed development inhibitor releasing coupler (DIR), preferably a non-timed DIR coupler and preferably a masking coupler.
• A magenta image dye-forming coupler
• DIR timed development inhibitor releasing coupler
• the magenta image dye-forming coupler (A) can be any image forming coupler dye useful in the photographic art.
• a typical magenta image dye-forming coupler is a pyrazolotriazole.
• Suitable couplers that form magenta dyes include:
• a preferred magenta image dye-forming coupler has the structure:
• Suitable timed DIR couplers comprise a DIR coupler (E) that is capable of releasing a mercaptotetrazole development inhibitor as noted with respect to the fast yellow layer.
• the masking coupler can be any masking coupler suitable for use in a photographic element.
• the masking coupler has structure:
• the masking coupler can be placed in any of the three magenta imaging layers.
• the non-timed DIR coupler (B) used in the fast magenta layer can be any non-timed DIR coupler known in the photographic art. Examples of such non-timed DIR couplers are disclosed in US-A-3,227,554 incorporated herein by reference.
• Preferred non-timed DIR couplers (B) have the structure:
• the mid-magenta or mid green sensitive layer comprises at least one first magenta image dye-forming coupler, and preferably at least one second magenta image dye-forming coupler, preferably a non-timed DIR coupler and preferably a cyan dye-forming coupler (C).
• the first magenta image dye-forming coupler can be coupler (A) referred to in the fast magenta layer.
• the second magenta image dye-forming coupler can be any image forming coupler dye useful in the photographic art and can include the magenta image dye-forming coupler (A) referred to in the fast magenta layer.
• Atypical magenta image dye-forming coupler is a pyrazolotriazole.
• a preferred second image dye-forming coupler is coupler (34).
• Coupler (14) is another preferred second magenta image dye forming coupler.
• Suitable non-timed DIR couplers useful in the mid magenta layer are as described for the fast magenta layer and can be preferred coupler (B), for example.
• the described cyan image dye-forming coupler (C) can be any cyan image dye-forming coupler known in the photographic art with its use in the magenta record herein referred to as a color correcting coupler.
• the cyan image dye-forming coupler is typically a phenol or naphthol coupler described in such representative patents and publications as noted herein.
• Preferred cyan image dye-forming couplers (C) for the mid magenta layer have the structures:
• Coupler (21) may also be used in the mid magenta layer.
• the slow magenta layer contains at least one magenta image dye-forming coupler which is preferably a bleach accelerating releasing coupler (BARC).
• BARC bleach accelerating releasing coupler
• the slow magenta layer also contains a development inhibiting releasing coupler (DIR) preferably a non-timed DIR.
• DIR development inhibiting releasing coupler
• the bleach accelerator releasing coupler can be any bleach accelerator releasing coupler known in the photographic art. Combinations of such couplers are also useful.
• the bleach accelerator releasing coupler can be represented by the formula: characterized in that
• a suitable bleach accelerator releasing coupler has the structure:
• a preferred bleach accelerator releasing coupler has the structure:
• Combinations of bleach accelerating couplers may be used the bleach accelerating coupler can be used in the other imaging layer including the magenta imaging layers.
• the DIR coupler for the slow magenta layer can be the same coupler (B) used for the fast magenta or mid magenta layer.
• An interlayer may be added between the fast and mid or mid and slow magenta layers.
• Cyan dye-forming coupler (C) may be used in the slow magenta layer as in the mid magenta layer.
• the interlayer between the slow magenta and the fast cyan layers can contain an oxidized developerscav- enger or dyes that are added to adjust photographic speed or density of the film.
• a preferred oxidized developer scavenger is as described for the yellow filter layer.
• the dyes can be the same as for the UV layer and an additional dye which is useful in this layer can include coupler (11).
• the fast cyan or most red sensitive layer contains a cyan image dye-forming coupler (C), a first non-timed DIR coupler, preferably a second non-timed DIR coupler, a masking coupler and a yellow image dye-forming correcting coupler.
• C cyan image dye-forming coupler
• the cyan image dye-forming coupler (C) useful in the fast cyan layer is as described for the mid magenta layer.
• the preferred cyan image dye-forming coupler is the same preferred coupler (C) as for the mid magenta layer.
• the first and second non-timed DIR couplers in the fast cyan layer or most red sensitive layer can be any development inhibitor releasing coupler known in the photographic art.
• Typical DIR couplers are described in, for example, US-A-3,227,554; 3,384,657; 3,615,506; 3,617,291; 3,733,201 and U.K. 1,450,479.
• Such DIR couplers upon oxidative coupling preferably do not contain a group that times or delays release of the development inhibitor group.
• the DIR coupler is typically represented by the formula:
• COUP is a coupler moiety and INH is a releasable development inhibitor group that is bonded to the coupler moiety at a coupling position.
• the coupler moiety COUP can be any coupler moiety that is capable of releasing the INH group upon oxidative coupling.
• the coupler moiety is, for example, a cyan, magenta or yellow forming coupler known in the photographic art.
• the COUP can be ballasted with a ballast group known in the photographic art.
• the COUP can also be monomeric, or it can form part of a dimeric, oligomeric or polymeric coupler, in which case more than one inhibitor group can be contained in the DIR coupler.
• the releasable development inhibitor group can be any development inhibitor group known in the photographic art.
• Illustrative INH groups are mercaptotetrazoles, selenotetrazoles, mercaptobenzothiazoles, selenobenzothiazoles, mercaptobenzimidazoles, selenobenzimidazoles, mercaptobenzoxazoles, selenobenzoxazoles, mercaptooxadiazoles, mercaptothiadiazoles, benzotriazoles, and benzodiazoles.
• Preferred inhibitor groups are mercaptotetrazoles and benzotriazoles. Particularly preferred inhibitor groups are described in for example US-A-4,477,563 and 4,782,012.
• Preferred DIR couplers within COUP-INH are coupler (37) and :
• Timed DIR couplers which may be used in this layer have the structures of couplers (24), (27) and (28) and
• the second non-timed DIR coupler which may be used in the fast cyan layer has the structure.
• a further second non-timed DIR coupler which may be used in the fast cyan layer has the structure of coupler (37).
• the masking coupler in the most red sensitive layer is typically a cyan dye-forming masking coupler, such as a naphthol cyan dye-forming masking coupler.
• a preferred cyan dye-forming masking coupler for the cyan dye-forming layers of the photographic element is:
• the yellow image dye-forming coupler can be any such coupler useful in the photographic art with its use in the cyan record sometimes referred to as a color correcting coupler.
• Couplers that are yellow dye forming couplers are typically acylacetamides, such as benzoylacetanilides and pivalylacetanilides as noted. Such couplers are described in such representative patents and publications as noted earlier.
• the yellow dye-forming coupler is preferably a pivalylacetanilide comprising a phenoxy coupling off group.
• Such yellow dye-forming couplers have the same structures as used in the slow yellow layer and the preferred coupler is coupler (6).
• the slow cyan or less sensitive red layer contains a cyan image dye-forming coupler (C), a timed DIR cou- pier or development inhibitoranchimeric releasing coupler (D)AR), a non-timed DIRcoupler, and a yellow image dye-forming correcting coupler.
• the cyan image dye-forming coupler can be the same cyan image dye-forming coupler (C) as used in the fast cyan layer.
• the yellow image dye-forming correcting coupler can be the same yellow image dye-forming coupler as used in the fast cyan layer.
• An illustrative development inhibitor releasing coupler containing at least one timing group (T) that enables timing of release of the development inhibitor group preferably has the structure of coupler (5).
• the non-timed DIR coupler can be the same as for the fast cyan layer.
• An interlayer is provided between the slow cyan layer and the antihalation layer.
• the interlayer can contain an oxidized developer scavenger.
• a preferred oxidized developer scavenger is as described for the yellow filter layer.
• This interlayer solves a problem of increased fog resulting from interaction of bleach accelerating releasing coupler with silver in the antihalation layer.
• providing this interlayer between a BARC containing layer anywhere in the element and the antihalation layer so as to isolate the antihalation layer from layers containing dye-forming couplers permits the advantageous use of BARC for good silver bleaching without increasing fog or Dmin with respect to the antihalation layer, for example, while maintaining desired acutance.
• the antihalation layer can contain very fine gray or black silver filamentary or colloidal silver, e.g. CLS, and preferably a UV absorbing dyes, gelatin and colored dyes such as coupler (11) to provide density to the film.
• CLS very fine gray or black silver filamentary or colloidal silver
• a UV absorbing dyes, gelatin and colored dyes such as coupler (11) to provide density to the film.
• filter dyes such as washout-dyes or decolorizing dyes of the type referred to herein may be used.
• the interlayer adjacent the antihalation layer may be omitted.
• Oxidized developer scavenger may be omitted from the antihalation layer when filter dyes are used. Examples of dyes which may be used in the antihalation layer are described in US-A-4,923,788 as noted earlier.
• Bleach accelerating silver salts as described with respect to the yellow filter layer may be used in the antihalation layer in conjunction with the finely divided silver.
• bleach accelerating silver salts are used in antihalation it is preferred to use the interlayer over the antihalation layer as noted to minimize fog or Dmin..
• the silver halide emulsions employed in the elements of this invention can be negative-working. Suitable emulsions and their preparation are described in Research Disclosure Sections I and II and the publications cited therein. Suitable vehicles for the emulsion layers and other layers of elements of this invention are described in Research Disclosure Section IX and the publications cited therein.
• the elements of the invention can include additional couplers as described in Research Disclosure Section VII, paragraphs D, E, F and G and the publications cited therein. These couplers can be incorporated in the elements and emulsions as described in Research Disclosure Section VII, paragraph C and the publications cited therein.
• the photographic elements of this invention or individual layers thereof can contain brighteners (see Research Disclosure Section V), antifoggants and stabilizers (See Research Disclosure Section VI), antistain agents and image dye stabilizers (see Research Disclosure Section VII, paragraphs I and J), light absorbing and scattering materials (see Research Disclosure Section VIII), hardeners (see Research Disclosure Section IX), plasticizers and lubricants (See Research Disclosure Section XII), antistatic agents (see Research Disclosure Section XIII), matting agents (see Research Disclosure Section XVI) development modifiers (see Research Disclosure Section XXI) surfactants and coating aids.
• brighteners see Research Disclosure Section V
• antifoggants and stabilizers See Research Disclosure Section VI
• antistain agents and image dye stabilizers see Research Disclosure Section VII, paragraphs I and J
• light absorbing and scattering materials see Research Disclosure Section VIII
• hardeners see Research Disclosure Section IX
• plasticizers and lubricants See Research Disclosure Section XII
• antistatic agents See Research Disclosure Section XIII
• the photographic elements can be coated on a variety of supports as described in Research Disclosure Section XVII and the references described therein.
• Photographic elements can be exposed to actinic radiation, typically in the visible region of the spectrum, to form a latent image as described in Research Disclosure Section XVIII and then processed to form a visible dye image as described in Research Disclosure Section XIX.
• Processing to form a visible dye image includes the step of contacting the element with a color developing agent to reduce developable silver halide and oxidize the color developing agent. Oxidized color developing agent in turn reacts with the coupler to yield a dye.
• a three color photographic film was prepared as follows using conventional surfactants, antifoggants and the materials indicated. After providing a developable image and then processing in accordance with the Kodak C-41 process (British Journal of Photographic, pp. 196-198 (1988)) excellent results e.g. improved color, sharpness, granularity and neutral scale, were obtained. All silver halide emulsions were stabilized with 1.75 gm 4-hydroxy-6-methyl-1,3,3a,7-tetraazaindene per mole of silver. All silver halide emulsions were sensitized with the appropriate spectral red, green and blue sensitizing dyes.
• a three color photographic film was prepared as follow using conventional surfactants, antifoggants and the materials indicated to illustrate the improvement in fog reduction using interlayers in conjunction with the finely divided silver layer, e.g. antihalation layer.
• the element was processed in accordance with the Kodak C-41 process (British Journal of Photographic, pp. 196-198 (1988).
• Photographic elements having the layer structure as shown in Example II were prepared to illustrate the improvement in red Dmin when the photographic element was prepared using bleach accelerating silver salts (BASS) in accordance with the invention.
• BASS bleach accelerating silver salts
• the element was prepared without a bleach accelerator releasing coupler and without an interlayerto isolate the antihalation layer containing finely divided silver.
• Table II shows that the normalized red Dmin is zero (0).
• the element was prepared and a bleach accelerating releasing coupler was used in the slow cyan (SC) layer. However, no interlayer was used between the antihalation layer and the remainder of the element. It will be noted that the normalized red Dmin increases to 0.054.
• a silver salt of mercapto proprionic acid (AgSCH 2 CH 2 COOH) was used in the antihalation and no interlayer was used between the antihalation layer and the remainder of the element.
• the normalized red Dmin increased to 0.093.
• the interlayer provided between the antihalation layer and the remainder of the element has the effect of markedly reducing the red Dmin.
• This example was prepared to illustrate the advantage of reduced fog when providing an interlayer between a filter layer containing finely divided silver and a bleach accelerating releasing coupler.
• the photographic element used was substantially the same as in Example I except finely divided silver was used in the yellow filter layer, an interlayer was provided above and below the finely divided silver layer, and bleach accelerating releasing couplers were provided in the slow yellow, fast magenta, and the mid magenta illustrated as follows:

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