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Claims  |
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What is claimed is:
1. A method of forming a color image which comprises processing a silver
halide color photographic material comprising a reflective support having
thereon at least one light-sensitive layer containing at least one coupler
which forms a dye upon a coupling reaction with an oxidation product of an
aromatic primary amine color developing agent and a silver halide emulsion
which contains at least 80% by mol of silver chloride with a color
developing solution which contains not more than 0.002 mol of a bromine
ion per liter for a development time of not more than 2 minutes and 30
seconds in the presence of at least one compound represented by the
following formula (I), (II), or (III):
##STR45##
wherein R represents an alkyl group, an alkenyl group, or an aryl group;
and X represents a hydrogen atom, an alkali metal atom, an ammonium group,
or a precursor;
##STR46##
wherein L represents a divalent connecting group; R' represents a hydrogen
atom, an alkyl group, an alkenyl group, or an aryl group; X has the same
meaning as defined in formula (I); and n represents 0 or 1; and
##STR47##
wherein R.sup.1, X, L, and n each has the same meaning as defined in
formula (II); R.sup.3 has the same meaning as defined for R'; and R.sup.1
and R.sup.3 may be the same or different, wherein the color developing
solution has a benzyl alcohol concentration of not more than 0.5 ml per
liter of the color developing solution and wherein the content of silver
iodide in the silver halide emulsion which contains at least 80% by mol of
silver chloride is not more than 1% by mol.
2. A method of forming a color image as claimed in claim 1, wherein a
substituent for the substituted alkyl group or the substituted alkenyl
group represented by R, R', or R.sup.3 is one or more members selected
from the group consisting of a halogen atom, a nitro group, a cyano group,
a hydroxyl group, an alkoxy group, an aryl group, an acylamino group, an
alkoxycarbonylamino group, a ureido group, an amino group, a heterocyclic
group, an acyl group, a sulfamoyl group, a sulfonamido group, a thioureido
group, a carbamoyl group, an alkylthio group, an arylthio group, a
heterocyclic thio group, and a carboxylic acid group or a sulfonic acid
group or a salt thereof.
3. A method of forming a color image as claimed in claim 1, wherein a
substituent for the substituted aryl group represented by R, R', or
R.sup.3 is one or more members selected from the group consisting of an
alkyl group, a halogen atom, a nitro group, a cyano group, a hydroxyl
group, an alkoxy group, an aryl group, an acylamino group, an
alkoxycarbonylamino group, a ureido group, an amino group, a heterocyclic
group, an acyl group, a sulfamoyl group, a sulfonamido group, a thioureido
group, a carbamoyl group, an alkylthio group, an arylthio group, a
heterocyclic thio group, and a carboxylic acid group or a sulfonic acid
group or a salt thereof.
4. A method of forming a color image as claimed in claim 1, wherein the
divalent connecting group represented by L is
##STR48##
or a combination thereof, wherein R.sup.0, R.sup.1, and R.sup.2 each
represents a hydrogen atom, an alkyl group, or an aralkyl group.
5. A method of forming a color image as claimed in claim 1, wherein the
compound represented by formulae (I), (II), or (III) is present in a
light-sensitive hydrophilic colloid layer or a light-insensitive
hydrophilic colloid layer of the silver halide color photographic material
and/or the color developing solution.
6. A method of forming a color image as claimed in claim 5, wherein an
amount of the compound to be incorporated into the silver halide color
photographic material is from 1.times.10.sup.-5 mol to 5.times.10.sup.-2
mol per mol of the silver halide present therein.
7. A method of forming a color image as claimed in claim 5, wherein an
amount of the compound to be added to the color developing solution is
from 1.times.10.sup.-6 mol to 1.times.10.sup.-3 mol per liter of the
solution.
8. A method of forming a color image as claimed in claim 1, wherein the
silver halide emulsion is a silver chlorobromide emulsion, and the
compound is selected from those represented by formula (I) or (II).
9. A method of forming a color image as claimed in claim 1, wherein an
amount of silver halide coated on the reflective support, which is
calculated in terms of silver, is not more than 0.78 g/m.sup.2.
10. A method of forming a color image as claimed in claim 1, wherein the
silver halide emulsion is a monodispersed silver halide emulsion having a
ratio of a standard deviation to an average grain size of not more than
0.2.
11. A method of forming a color image as claimed in claim 1, wherein the
silver halide color photographic material comprises at least one
blue-sensitive silver halide emulsion layer containing at least one yellow
color forming coupler, at least one green-sensitive silver halide emulsion
layer containing at least one magenta color forming coupler, and at least
one red-sensitive silver halide emulsion layer containing at least one
cyan color forming coupler.
12. A silver halide color photographic material which comprises a
reflective support having thereon at least one light-sensitive layer
containing at least one coupler which forms a dye upon a coupling reaction
with an oxidation product of an aromatic primary amine color developing
agent and a silver halide emulsion which contains at least 80% by mol of
silver chloride and substantially no silver iodide, wherein the silver
halide color photographic material has at least one layer coated on the
support, which contains at least one compound represented by the following
formulae (I), (II), or (III):
##STR49##
wherein R represents an alkyl group, an alkenyl group, or an aryl group;
and X represents a hydrogen atom, an alkali metal atom, an ammonium group,
or a precursor;
##STR50##
wherein L represents a divalent connecting group; R' represents a hydrogen
atom, an alkyl group, an alkenyl group, or an aryl group; X has the same
meaning as defined in formula (I); and n represents 0 or 1; and
##STR51##
wherein R', X, L, and n each has the same meaning as defined in formula
(II); R.sup.3 has the same meaning as defined for R'; and R' and R.sup.3
may be the same or different; and an amount of silver halide coated on the
support, which is calculated in terms of silver, is not more than 0.78
g/m.sup.2.
13. A silver halide color photographic material as claimed in claim 12,
wherein a substituent for the substituted alkyl group or the substituted
alkenyl group represented by R, R', or R.sup.3 is one or more members
selected from the group consisting of a halogen atom, a nitro group, a
cyano group, a hydroxyl group, an alkoxy group, an aryl group, an
acylamino group, an alkoxycarbonylamino group, a ureido group, an amino
group, a heterocyclic group, an acyl group, a sulfamoyl group, a
sulfonamido group, a thioureido group, a carbamoyl group, an alkylthio
group, an arylthio group, a heterocyclic thio group, and a carboxylic acid
group or a sulfonic acid group or a salt thereof.
14. A silver halide color photographic material as claimed in claim 12,
wherein a substituent for the substituted aryl group represented by R, R',
or R.sup.3 is one or more members selected from the group consisting of an
alkyl group, a halogen atom, a nitro group, a cyano group, a hydroxyl
group, an alkoxy group, an aryl group, an acylamino group, an
alkoxycarbonylamino group, a ureido group, an amino group, a heterocyclic
group, an acyl group, a sulfamoyl group, a sulfonamido group, a thioureido
group, a carbamoyl group, an alkylthio group, an arylthio group, a
heterocyclic thio group, and a carboxylic acid group or a sulfonic acid
group or a salt thereof.
15. A silver halide color photographic material as claimed in claim 12,
wherein the divalent connecting group represented by L is
##STR52##
or a combination thereof, wherein R.sup.0, R.sup.1, and R.sup.2 each
represents a hydrogen atom, an alkyl group, or an aralkyl group.
16. A silver halide color photographic material as claimed in claim 12,
wherein an amount of the compound to be incorporated into the silver
halide color photographic material is from 1.times.10.sup.-5 mol to
5.times.10.sup.-2 mol per mol of the silver halide present therein.
17. A silver halide color photographic material as claimed in claim 12,
wherein a content of silver iodide is not more than 1% by mol.
18. A silver halide color photograpic material as claimed in claim 12,
wherein the compound is selected from those represented by formula (I) or
(II).
19. A silver halide color photographic material as claimed in claim 12,
wherein the silver halide emulsion contains at least 90% by mol of silver
chloride.
20. A silver halide color photographic material as claimed in claim 12,
wherein the silver halide emulsion is a monodispersed silver halide
emulsion having a ratio of a standard deviation to an average grain size
of not more than 0.2.
21. A silver halide color photographic material as claimed in claim 12,
wherein the silver halide color photographic material comprises at least
one blue-sensitive silver halide emulsion layer containing at least one
yellow color forming coupler, at least one green-sensitive silver halide
emulsion layer containing at least one magenta color forming coupler, and
at least one red-sensitive silver halide emulsion layer containing at
least one cyan color forming coupler.
22. A method of forming a color image as claimed in claim 1, wherein said
precursor is a group capable of becoming a hydrogen atom or an alkali
metal atom under alkaline conditions.
23. A method of forming a color image as claimed in claim 22, wherein said
precursor is selected from the group consisting of an acetyl group, a
cyanoethyl group and a methane sulfonyl ethyl group.
24. A silver halide color photographic material as claimed in claim 12,
wherein said precursor is a group capable of becoming a hydrogen atom or
an alkali metal atom under alkaline conditions.
25. A silver halide color photographic material as claimed in claim 24,
wherein said precursor is selected from the group consisting of an acetyl
group, a cyanoethyl group and a methane sulfonyl ethyl group. |
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Claims |
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Description |
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FIELD OF THE INVENTION
The present invention relates to a method of forming a color image and a
silver halide color photographic material, and more particularly, to a
silver halide color photographic material and a method of forming a color
image, which have high sensitivity and enable rapid processing to be
conducted with control of fog formation.
BACKGROUND OF THE INVENTION
Many kinds of silver halide color photographic materials and methods of
forming color images are commercially available at the present time.
Various improvements and inventions thereon have been made depending on
the end use. It is generally required that silver halide emulsions
employed in these photographic light-sensitive materials have high
sensitivity. Therefore, silver iodobromide, silver chloroiodobromide, and
silver chlorobromide each being mainly composed of silver bromide, are
used as the silver halide in the emulsions at present. Further, various
kinds of development accelerators have been investigated in order to
increase the color forming property and to shorten the processing time in
color development during processing of color photographic light-sensitive
materials. Particularly, benzyl alcohol is widely employed at present.
Recently, however, reduction of development processing time, simplification
of the processing system and operation, and achievement of low
environmental pollution have been highly required in addition to high
sensitivity.
This is because reduction of the period to finish, simplification of
laboratory work, improvement in productivity and miniaturization, and
simple operation of the processing system for small scale laboratories
which are designated so-called mini-labos, etc., are desired. With respect
to these requirements of rapid processing, simplification of the
processing system, and achievement of low environmental pollution, benzyl
alcohol which is used in the color developing solution causes severe
problems.
Since benzyl alcohol has a low water solubility, it is necessary to use a
solvent such as diethylene glycol, etc., in order to assist in dissolution
of the benzyl alcohol. These compounds including benzyl alcohol exhibit
large values of BOD (biological oxygen demand) and COD (chemical oxygen
demand) which indicate a large load for prevention from environmental
pollution. Therefore, it is desirable to eliminate these compounds in view
of the preservation of good surroundings. Also, it takes much time to
dissolve benzyl alcohol in a developing solution even when the
above-described solvent is employed and, thus, it is desired to eliminate
benzyl alcohol for the purpose of simplification of work for the
preparation of the developing solution. However, to simply eliminate
benzyl alcohol results in a severe lag of color development which is
contrary to the needs of rapid processing in the market. Thus, it has been
desired to develop a means which is a substitute for the use of benzyl
alcohol.
Silver halides mainly composed of silver bromide which have been mostly
employed hitherto are theoretically disadvantageous for the purpose of
rapid processing since bromine ions which are released from the silver
halides when they are developed have a development inhibiting function.
From the standpoint of rapid processing, it is preferred to employ silver
halides mainly composed of silver chloride. However, it is known that
silver halide emulsions mainly composed of silver chloride have some
disadvantages in that they are apt to fog while they have a high
development speed; they are poor in preservation stability; and that they
have low sensitivity.
Because of their disadvantages described above, it is difficult for silver
halides mainly composed of silver chloride to materialize their excellent
developability in methods of forming images having relatively high
sensitivity.
Accordingly, many attempts have been made in order to overcome these
disadvantages. For instance, in order to increase sensitivity, silver
chlorobromide emulsions having a high silver chloride content which
contain silver chlorobromide grains having a stratiform structure are
known. These silver chlorobromide emulsions are described in detail, for
example, in Japanese Patent Application (OPI) Nos. 95736/83, 108533/83,
222844/85, and 222845/85 (the term "OPI" as used herein refers to a
"published unexamined Japanese patent application"). Further, a method for
increasing sensitivity by means of doping metal ions in inner portions of
grains is described in Japanese Patent Application (OPI) No. 135832/80.
Fog also occurs during sensitization of grains formed. Methods for
restraining such a fog are described in Japanese Patent Application (OPI)
Nos. 125612/83 and 47940/86.
Although various attempts for increasing sensitivity and restraining the
formation of fog with respect to silver halides mainly composed of silver
chloride have been made while maintaining their excellent developability,
they are still insufficient and, thus, a further improvement has been
desired.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a silver halide
color photographic material which is applicable to rapid processing
providing high sensitivity and controlled fog formation, and a method of
forming a color image which has a small load for prevention of
environmental pollution and simple work for preparation of a processing
solution using the silver halide color photographic material.
Another object of the present invention is to provide a method of forming a
color image which has a small load for prevention of environmental
pollution and simple work for preparation of a processing solution using a
silver halide color photographic material which is applicable to rapid
processing providing high sensitivity and low fog, whereby simplification
of a laboratory work, improvement in productivity and miniaturization,
simple operation, and low environmental pollution of the processing system
are achieved.
Other objects of the present invention will become apparent from the
following description and examples.
These objects of the present invention can be attained by a method of
forming a color image which comprises processing a silver halide color
photographic material comprising a reflective support having thereon at
least one light-sensitive layer containing at least one coupler which
forms a dye upon a coupling reaction with an oxidation product of an
aromatic primary amine color developing agent and a silver halide emulsion
which contains at least 80% by mol of silver chloride and substantially no
silver iodide with a color developing solution which contains not more
than 0.002 mol of a bromine ion per liter and substantially no benzyl
alcohol for a development time of not more than 2 minutes and 30 seconds
in the presence of at least one compound represented by the following
formulae (I), (II), or (III).
##STR1##
wherein R represents an alkyl group, an alkenyl group, or an aryl group;
and X represents a hydrogen atom, an alkali metal atom, an ammonium group,
or a precursor;
##STR2##
wherein L represents a divalent connecting group; R' represents a hydrogen
atom, an alkyl group, an alkenyl group, or an aryl group; X has the same
meaning as defined in formula (I); and n represents 0 or 1; and
##STR3##
wherein R', X, L, and n each has the same meaning as defined in formula
(II); R.sup.3 has the same meaning as defined for R'; and R' and R.sup.3
may be same or different; or a silver halide color photographic material
which comprises a reflective support having thereon at least one
light-sensitive layer containing at least one coupler which forms a dye
upon a coupling reaction with an oxidation product of an aromatic primary
amine color developing agent and a silver halide emulsion which contains
at least 80% by mol of silver chloride and substantially no silver iodide,
wherein the silver halide color photographic material has at least one
layer coated on the support, which contains at least one compound
represented by the following formulae (I), (II), or (III):
##STR4##
wherein R represents an alkyl group, an alkenyl group, or an aryl group;
and X represents a hydrogen atom, an alkali metal atom, an ammonium group,
or a precursor;
##STR5##
wherein L represents a divalent connecting group; R' represents a hydrogen
atom, an alkyl group, an alkenyl group, or an aryl group; X has the same
meaning as defined in formula (I); and n represents 0 or 1; and
##STR6##
wherein R', X, L, and n each has the same meaning as defined in formula
(II); R.sup.3 has the same meaning as defined for R'; and R' and R.sup.3
may be the same or different, with the amount of the silver halide coated
on the support, which is calculated in terms of silver, being not more
than 0.78 g/m.sup.2.
DETAILED DESCRIPTION OF THE INVENTION
The compounds represented by formulae (I), (II), or (III) will now be
described in detail.
The alkali metal atom represented by X includes, for example, a sodium atom
and a potassium atom. The ammonium group represented by X includes, for
example, a tetramethylammonium group and a trimethylbenzylammonium group.
The term "precursor" means a group capable of becoming a hydrogen atom or
an alkali metal atom under an alkaline condition and includes, for
example, an acetyl group, a cyanoethyl group, and a methanesulfonylethyl
group.
The alkyl group and the alkenyl group represented by R, R', or R.sup.3
include an unsubstituted or substituted alkyl group and an unsubstituted
or substituted alkenyl group and further may be of an alicyclic form.
Examples of substituents for the substituted alkyl group or the substituted
alkenyl group include a halogen atom, a nitro group, a cyano group, a
hydroxyl group, an alkoxy group, an aryl group, an acylamino group, an
alkoxycarbonylamino group, a ureido group, an amino group, a heterocyclic
group, an acyl group, a sulfamoyl group, a sulfonamido group, a thioureido
group, a carbamoyl group, an alkylthio group, an arylthio group, a
heterocyclic thio group, and a carboxyl group or a sulfonic group or a
salt thereof.
The above-described ureido group, thioureido group, sulfamoyl group,
carbamoyl group, and amino group each includes an unsubstituted group, an
N-alkyl-substituted group, and an N-aryl-substituted group thereof.
The aryl group represented by R, R', or R.sup.3 include, for example, a
phenyl group, a substituted phenyl group, etc. Examples of substituents
for the substituted aryl group include an alkyl group and the substituents
as defined above for the substituted alkyl group.
Suitable examples of the divalent connecting group represented by L include
##STR7##
or a combination thereof, wherein R.sup.0, R.sup.1, and R.sup.2 each
represents a hydrogen atom, an alkyl group, or an aralkyl group.
Specific examples of the compounds represented by formulae (I), (II), or
(III) are set forth below, but the present invention should not be
construed as being limited thereto.
##STR8##
The compound represented by formulae (I), (II), or (III) used in the
present invention can be added to any layer of a silver halide color
photographic material or to the color developing solution. Suitable layers
of the silver halide color photographic material include a light-sensitive
hydrophilic colloid layer and a light-insensitive hydrophilic colloid
layer.
The amount of the compound represented by formulae (I), (II), or (III) to
be incorporated into a silver halide color photographic material is
preferably from 10.times.10.sup.-5 mol to 5.times.10.sup.-2 mol and more
preferably from 1.times.10.sup.-4 mol to 1.times.10.sup.-2 mol per mol of
the silver halide. On the other hand, in the case of adding the compound
to a color developing solution, the amount added is preferably from
1.times.10.sup.-6 mol to 1.times.10.sup.-3 mol and more preferably from
5.times.10.sup.-6 mol to 5.times.10.sup.-4 mol per liter of the solution.
When the amount of the compound added is smaller than the above-described
value, the antifogging effect on the silver halide emulsion may be
insufficient and cause color turbidity. On the contrary, use of a larger
amount of the compound than the above-described value may cause a decrease
in sensitivity or a decrease in density due to restraint of development
which results in deterioration of color reproducibility.
The term "color developing solution containing substantially no benzyl
alcohol" as used in the present invention means a color developing
solution containing benzyl alcohol in a concentration of not more than 0.5
ml per liter of the solution. It is preferred that the color developing
solution does not contain benzyl alcohol at all.
The amount of bromine ions contained in the color developing solution used
in the present invention is not more than 0.002 mol and preferably not
more than 0.0007 mol per liter of the solution. Most preferably, the color
developing solution does not contain bromine ions at all. Although the
amount of bromine ions relates to the content of silver bromide in the
silver halide emulsion, when a higher amount thereof than the
above-described value is employed, there is a tendency to restrain
development, whereby sufficiently high density cannot be obtained.
The silver halide emulsion which can be used in the present invention
comprises a silver halide containing at least 80% by mol of silver
chloride and substantially no silver iodide. The content of silver
chloride in the silver halide emulsion is preferably at least 90% by mol
and more preferably at least 95% by mol. A pure silver chloride emulsion
can be employed. When the content of silver chloride in the emulsion is
lower than the above-described value, the development proceeds slowly,
whereby it is difficult to obtain sufficiently high density.
The term "silver halide emulsion containing substantially no silver iodide"
as used in the present invention means a silver halide emulsion having a
content of silver iodide of not more than 1% by mol and more preferably
not more than 0.5% by mol. Most preferably, the silver halide emulsion
does not contain silver iodide at all. To add silver iodide is not desired
because of retardation in development speed and increase in fog in some
cases.
The amount of the silver halide coated on a reflective support which is
calculated in terms of silver is preferably not more than 0.78 g/m.sup.2.
When the amount of the silver halide coated is too great, the development
again proceeds slowly, whereby it is difficult to obtain a sufficiently
high density.
The average grain size of silver halide grains in the silver halide
emulsion used in the present invention (the grain size being defined as
grain diameter if the grain has a spherical or approximately spherical
shape, or as the edge length in the case of cubic grains, and being
averaged based on the projected areas of the grains) is preferably from
0.1 .mu.m to 2 .mu.m and more preferably from 0.2 .mu.m to 1.3 .mu.m.
Further, it is preferred to employ a monodispersed silver halide emulsion.
The grain size distribution which represents a degree of the
monodispersibility is preferably not more than 0.2 and more preferably not
more than 0.15 in terms of a ratio (s/d) of a statistical standard
deviation (s) to an average grain size (d).
Silver halide grains which can be used in the present invention may have
different layers in the inner portion and on the surface portion,
multiphase structures containing junctions or may be uniform throughout
the grains. Further, a mixture of these silver halide grains having
different structures may be employed.
Silver halide grains which can be used in the present invention may have a
regular crystal structure, for example, a cubic, octahedral, dodecahedral,
or tetradecahedral structure; an irregular crystal structure, for example,
a spherical structure; or a composite structure thereof. Further, tabular
silver halide grains can be used. Particularly, a silver halide emulsion
can be employed wherein tabular silver halide grains having a ratio of
diameter/thickness of at least 5 and preferably at least 8 account for at
least 50% of the total projected area of the silver halide grains present.
In addition, mixtures of silver halide grains having different crystal
structures may be used. These silver halide emulsions may be those of the
surface latent image type in which latent images are formed mainly on the
surface thereof and those of the internal latent image type in which
latent images are formed mainly in the interior thereof.
Photographic emulsions as used in the present invention can be prepared in
any suitable manner, for example, by the methods as described in P.
Glafkides, Chimie et Physique Photographique, Paul Montel (1967), G. F.
Duffin, Photographic Emulsion Chemistry, The Focal Press (1966), and V. L.
Zelikman et al., Making and Coating Photographic Emulsion, The Focal Press
(1964). That is, any of an acid process, a neutral process, and an ammonia
process can be employed.
Soluble silver salts and soluble halogen salts can be reacted by techniques
such as a single jet process, a double jet process, and a combination
thereof. In addition, there can be employed a method (a so-called reversal
mixing process) in which silver halide grains are formed in the presence
of an excess of silver ions. As one system of the double jet process, a
so-called controlled double jet process in which the pAg in a liquid phase
where a silver halide is formed is maintained at a predetermined level can
be employed. This process gives a silver halide emulsion in which the
crystal form is regular and the particle size is nearly uniform.
Further, a silver halide emulsion may be employed which is prepared by a
so-called conversion method involving a process in which a silver halide
previously formed is converted to a silver halide having a lower
solubility before the completion of formation of silver halide grains or
in which a silver halide emulsion is subjected to similar halogen
conversion after the completion of formation of silver halide grains.
During the step of formation or physical ripening of silver halide grains,
cadmium salts, zinc salts, lead salts, thallium salts, iridium salts or
complex salts thereof, rhodium salts or complex salts thereof, and iron
salts or complex salts thereof may be allowed to coexist.
After the formation of silver halide grains, the silver halide emulsions
are usually subjected to physical ripening, removal of soluble salts, and
chemical ripening and then employed for coating.
Known silver halide solvents (for example, ammonia, potassium thiocyanate,
and thioethers or thione compounds as described in U.S. Pat. No. 3,271,157
and Japanese Patent Application (OPI) Nos. 12360/76, 82408/78, 144319/78,
100717/79, and 155828/79) can be employed during the step of formation,
physical ripening, or chemical ripening of the silver halide.
For removal of soluble silver salts from the emulsion after physical
ripening, a noodle washing process, a flocculation process, or an
ultrafiltration process can be employed.
To the silver halide emulsion which can be used in the present invention, a
sulfur sensitization method using active gelatin or compounds containing
sulfur capable of reacting with silver (for example, thiosulfates,
thioureas, mercapto compounds, and rhodanines), a reduction sensitization
method using reducing substances (for example, stannous salts, amines,
hydrazine derivatives, formamidinesulfinic acid, and silane compounds), a
noble metal sensitization method using metal compounds (for example,
complex salts of Group VIII metals in the Periodic Table, such as Pt, Ir,
Pd, Rh, or Fe as well as gold complex salts); and so forth can be applied
alone or in combination with each other.
Of the above-described chemical sensitizations, a sulfur sensitization
alone is preferred.
Further, in order to achieve the desired gradation of the color
photographic light-sensitive material, two or more monodispersed silver
halide emulsions which have substantially the same spectral sensitivity
but have different grain sizes from each other can be mixed in one
emulsion layer or can be coated in the form of superimposed layers
(regarding monodispersibility, the coefficient of variation described
above is preferred). Moreover, two or more polydispersed silver halide
emulsions or combinations of a monodispersed emulsion and a polydispersed
emulsion may be employed in a mixture or in the form of superimposed
layers.
Each of blue-sensitive, green-sensitive, and red-sensitive emulsions used
in the present invention can be spe | | |
