Dye image forming process

In a dye image forming process in color photography comprising imagewise exposing a photographic element comprising a support and a light sensitive silver halide emulsion layer, and processing the exposed photographic element with an alkaline processing solution in the presence of a dye developer whereby a dye image corresponding to the imagewise exposure is formed by oxidation of said developer as a function of development of silver halide, the improvement which comprises the dye developer being a mono azo dye developer represented by the following formula: EQU X--N.dbd.N--Y--NH--Z wherein X represents a monovalent group selected from an aromatic group, a non-aromatic-heterocyclic active-methylene-containing group, a non-aromatic-heterocyclic active-methyne-containing group, an aliphatic active-methylene-containing group, and an aliphatic active-methyne-containing group; and Y and Z respectively represent divalent and monovalent groups of an aromatic group, at least one of the X, Y and Z has therein at least one of the developer groups which are either capable of developing silver halide or changeable to a group capable of developing silver halide, the azo radical (--N=N--) and the secondary amino radical (--NH--) are respectively attached to the adjacent carbon atoms in Y, the azo radical being attached to an aromatic ring of the aromatic group of X or to the active methylene or methyne of X and is attached to an aromatic ring of the aromatic group of Y, and the amino radical is attached to aromatic rings of Y and Z.

The present invention relates to a process for forming a dye image in a 
light-sensitive silver halide color photographic material. Particularly, 
this invention is concerned with a dye image forming process using a dye 
developer. More particularly, it is concerned with a dye image forming 
process suitable for a color diffusion transfer utilizing a dye developer. 
There have heretofore been known various dye image forming processes 
represented by such as a color development process using a dye resulting 
from a reaction of a color developing agent and a coupler or the so-called 
silver dye bleach process in which an azo dye is bleached in the presence 
of metallic silver. 
Further, the so-called color diffusion transfer process is also known as a 
dye image forming process based on a technical idea different from those 
on which the above-mentioned two processes are based. This process 
includes such a process as disclosed in U.S. Pat. No. 2,647,049, in which 
a coupler used is rendered nondiffusible in a developed silver halide 
portion, such a process as disclosed in U.S. Pat. No. 3,087,817, in which 
a dye used is rendered non-diffusible at a developed portion, such a 
process as disclosed in U.S. Pat. No. 3,443,939, in which a compound 
capable of releasing a diffusible dye upon oxidation, or such a process as 
disclosed in U.S. Pat. No. 3,443,941, in which a linkage or cleavage 
reaction is carried out by utilizing unexposed silver halide, thereby to 
produce imagewise distribution of diffusible dyes. In addition to these, 
the so-called dye developer process is already well known, in which a 
light-sensitive element comprising a combination of a light-sensitive 
silver halide emulsion and a dye developer containing both a group capable 
of developing a silver halide and a dye moiety is imagewise exposed to 
light and, thereafter, the exposed element is subjected to an alkaline 
processing solution to develop the silver halide present in the exposed 
region, thereby rendering the dye developer present in the exposed region 
immovable, and the dye developer present in the unexposed region is 
imagewise diffusion-transferred to an image-receiving element superposed 
on the aforesaid light-sensitive element to obtain a dye image diffused 
thereto and formed therein. In this process, a positive image can be 
obtained by diffusion-transfer of the dye developer in the unexposed 
region to the image-receiving element. This dye developer diffusion 
transfer process has such advantages that the processing is simple and 
that the time required therefor is shorter in comparison with the 
before-mentioned color development process or silver dye bleach process. 
As a dye developer is heretofore known a disazo type dye developer 
containing, in its molecule, two azo groups, an amino group and a group 
capable of developing silver halide, one of the two hydrogen atoms of the 
amino group being substituted by an aromatic group. This disazo type dye 
developer, however, has such defects that its spectral absorption region 
is too broad to reproduce colors well and that it causes the 
desensitization of silver halide. Further as another known dye developer, 
there is a monoazo type dye developer containing, in its molecule, only 
one azo group, a group capable of developing silver halide and an amino 
group or an amino group one of whose hydrogen atoms is substituted by an 
alkyl group. This monoazo type dye developer, however, has a problem in 
its preservation resulting from its poor stability against light and 
chemical attack. 
The first object of this invention is to provide a process for forming an 
excellent dye image by utilizing a novel dye developer which can overcome 
the aforesaid defects. Another object of this invention is to obtain a dye 
image of high sensitivity and clear color tone within a relatively shorter 
processing time. Other objects of the invention will hereinafter be 
understood. 
We have found that the above-mentioned objects can be accomplished by 
employing an image forming process comprising the following steps: a step 
of imagewise exposing a light-sensitive silver halide photographic element 
and then processing the said material with an alkaline processing solution 
in the presence of a monoazo type dye developer to form a dye image 
corresponding to imagewise exposure, which dye developer is represented by 
the following formula (I): 
EQU X--N.dbd.N--Y--NH--Z (I) 
wherein X represents a monovalent group selected from an aromatic group, a 
non-aromatic-heterocyclic active-methylene-containing group, a 
non-aromatic-heterocyclic active-methyl-containing group, an aliphatic 
active-methylene-containing group, and an aliphatic 
active-methyne-containing group; and Y and Z respectively represent 
divalent and monovalent groups of an aromatic group, provided that at 
least one of X, Y and Z has therein at least one of the developer groups 
which are either capable of developing silver halide or changeable to a 
group capable of developing silver halide, the changeable group being 
hereinafter referred as a "precursor" of the group capable of developing 
silver halide, and further provided that the azo radical (--N.dbd.N--) and 
the secondary amino radical (--NH--) are respectively attached to the 
adjacent carbon atoms in Y. 
The aromatic group as set forth above is a divalent or monovalent group 
derived from an aromatic hydrocarbon group such as a substituted or 
unsubstituted benzene or naphthalene group or an aromatic heterocyclic 
group such as a substituted or unsubstituted pyridine group, pyrimidine 
group, furan group or thiophene group. Among them, those which have the 
most preferable effect in this invention are a benzene group and a 
naphthalene group, both being unsubstituted or substituted. 
Further, the aforesaid non-aromatic heterocyclic or aliphatic group 
containing active methylene or methyne includes a monovalent group derived 
from 3-phenylisooxazole-5-one groups, 2,4-dioxochromane groups, 
1,3-indandione groups, 1,3-cyclohexanedione groups, benzoylacetanilide 
groups, 2-(2'-cyanoacetyl)-coumarone groups, pivaloylacetanilide groups, 
p-nitrophenylacetic ester groups and .alpha.-cyanoacetophenone groups. 
Further, the aromatic group or non-aromatic heterocyclic (or aliphatic) 
active methylene-(or methyne-) containing group may be substituted with 
various kinds of substituents such as an alkyl group, an aryl group, an 
alkoxy group, an aryloxy group, halogen, nitro, cyano, an acyloxy group, 
an aralkyl group, hydroxyl, an amino group, a carbamoyl group, a sulfamoyl 
group or an arylamino group. 
The above-mentioned developer group is preferably a group having at least 
two hydroxyl groups and having developing effect on silver halide. The 
typical examples of this group include such as an o-dihydroxyphenyl group, 
a p-dihydroxyphenyl group and a 2,3,4-trihydroxyphenyl group, and these 
groups include those substituted with halogen or alkyl, while the group 
having preferable effect in this invention is p-dihydroxyphenyl or 
halogen- or alkyl-substituted p-dihydroxyphenyl. The precursor of the 
group capable of developing silver halide is such as a silver 
halide-developer group having a hydroxyl group or groups which are 
acylated so that said group loses its function to develop silver halide 
under ordinary circumstances but can recover said function by reaction 
with an alkaline processing solution. The typical examples of the 
aforesaid acylation of the hydroxyl group include, for example, 
acetylation, trifluoroacetylation, butyrylation, formylation and 
ethoxycarbonylation. 
The developer group or its precursor is attached to any desired position of 
X, Y and Z in formula (I), which group preferably contains a linking part 
which can bond both not so as to impair the functions of both. The linking 
part, however, is preferably connected to at least either of X and Z in 
the general formula (I). As the linking part, various divalent organic 
groups can be used and the typical examples thereof are --CO--, --N(an 
alkyl group)--, --NH--, --S--, --O--, --SO.sub.2 --, alkylene, arylene, a 
divalent alicyclic group, a divalent heterocyclic group and a divalent 
organic group comprising the combination of these groups. While the 
monoazo type dye developer contains 1 to 4 of the developer groups or the 
precursors thereof, it is preferable that 1 to 2 of them are present 
therein. 
When such an oxygen containing group as an alkoxy group a hydroxyl group 
including the tautomer thereof or a group yielding the hydroxyl group by 
hydrolysis is introduced into at least one of the X, Y and Z, the desired 
result can be obtained because the elution of this monoazo type dye 
developer is excellent. Said group yielding a hydroxyl group by hydrolysis 
is, for example, an acyloxy group. Among the oxygen-containing group, 
preferred are the hydroxy group and the group yielding the hydroxyl group. 
In case of using, in this invention, the monoazo dye developer in which the 
oxygen-containing group is introduced into at least one of X, Y and Z in 
the general formula (I) and in which Y is a naphthylene or phenylene 
group, said naphthylene group being bonded with an azo group at its 
.alpha.-position and provided at its 4-position with the oxygen-containing 
group, or said phenylene group being provided at its 4-position with the 
oxygen-containing group, more preferable result can be obtained because 
such monoazo type dye developer is excellent in good elutability and has a 
high molar extinction coefficient. 
The typical examples of the dye developer which can be used in this 
invention will be illustrated in the following but without limiting the 
invention thereto: 
##STR1## 
The monoazo type dye developer used in this invention is prepared according 
to the following procedures. 
An aminoazo compound having an amino group on an aromatic group bonded with 
an azo group is reacted with a halogen-substituted aromatic compound to 
introduce an aromatic group into said amino group. Alternatively, an 
aromatic diazonium salt having an amino group substituted with an aromatic 
group and an azo coupler, or an aromatic diazonium salt and an azo coupler 
having an amino group substituted with an aromatic group, are subjected to 
the coupling reaction to form an azo compound having an amino group 
substituted with an aromatic group. Then, the developer moiety in an 
oxidized form is introduced into the above-mentioned azo compound having 
an amino group substituted with an aromatic group and then reduced thereby 
to prepare the dye developer used in this invention. Either, the developer 
moiety may be presented as a precursor of a group capable of developing 
silver halide. In the latter case, the aforesaid precursor as presented is 
required only to be hydrolyzed, but, even if the precursor is not 
subjected to hydrolysis, the dye developer having the precursor of a 
silver halide-developing group as its developer moiety may be used as such 
in this invention. Further, the monoazo type dye developer used in this 
invention can be prepared by introducing beforehand the developer moiety 
in its oxidized form or the precursor thereof into a starting material or 
intermediate in the process of preparing the azo compound having an amino 
group substituted with an aromatic group. 
Concrete synthesis examples for the monoazo type dye developer used in this 
invention will be illustrated, as follows: 
SYNTHESIS EXAMPLE 1 
Preparation of compound (5) 
8.1 g (0.026 mole) of .beta.-(2,5-dicathyloxyphenyl)-propionic acid was 
dispersed into 100 ml of thionyl chloride and the resulting dispersion was 
refluxed for 4 hours. The dispersion was placed under a reduced pressure 
to evaporate the solvent and added with 30 ml of dry benzene. The mixture 
was again placed under the reduced pressure to evaporate the benzene and 
the remaining thionyl chloride and diluted by adding 30 ml of benzene 
thereto to prepare the corresponding acid chloride solution. 5.5 g (0.02 
mole) of 2-amino-2'-phenylazodiphenylamine in a flask was dissolved by 
adding 50 ml of benzene and 10 ml of hexane. The resulting solution was 
added with 8 ml of dimethylaniline. Into the resulting mixture, the 
aforesaid acid chloride solution was added dropwise at 0.degree. C. While 
the temperature was increased gradually up to a room temperature, the 
mixture was stirred for 4 hours. Then, it was diluted with 400 ml of 
benzene, washed with 200 ml of water and 10 ml of aqueous ammonia, further 
washed with diluted hydrochloric acid and water, and added with sodium 
sulfate. The resulting mixture was left alone over night and then 
filtered. The filtrate was subjected to evaporation under a reduced 
pressure to obtain a red solid. The solid mass was recrystallized from 
ethanol-water to yield 9.0 g of red crystalline needles having m.p. 
109.degree.-110.degree. C. and .lambda..sub.max 458 nm (in methanol). 
SYNTHESIS EXAMPLE 2 
Preparation of compound (6) 
The same procedures for the preparation of compound (5) were repeated but 
using 2-amino-4-chloro-2'-phenylazodiphenylamine, thereby to prepare the 
title compound. Yield of 72%, m.p. 145.degree.-146.degree. C. and 
.lambda..sub.max 450 nm (in methanol). 
SYNTHESIS EXAMPLE 3 
Preparation of compound (1) 
1.0 g of sodium hydroxide was dissolved into a solvent mixture of 30 ml of 
ethanol and 10 ml of water. The resulting solution was cooled to 0.degree. 
C. and 5 ml of an acetone solution containing 1.0 g of compound (5) was 
added dropwise thereinto under a nitrogen atmosphere. The mixture was 
stirred at 0.degree. C. for one hour, added with 100 ml of water and then 
with hydrochloric acid and aqueous ammonia to keep the mixture at pH 4. 
The precipitate resulting in the mixture was collected by filtration and 
recrystallized from ethanol-water to obtain 0.6 g of red crystalline 
needles having m.p. 116.degree.-117.degree. C. Yield of 82%, 
.lambda..sub.max 450 nm (in methanol). 
SYNTHESIS EXAMPLE 4 
Preparation of compound (17) 
The same procedures for preparation of compound (1) were repeated but using 
compound (6) instead of compound (5). Yield of 85%, m.p. 
172.degree.-173.degree. C. .lambda..sub.max 440 nm (in methanol). 
SYNTHESIS EXAMPLE 5 
Preparation of compound (39) 
The compound (a) as referred herein is 
3-(N-trifluoroacetylanilino)-4-[p-(2',5'-diacetoxyphenethyl)-phenylazo]phe 
nol. 
10.0 g of 3-hydroxydiphenylamine was dissolved into 20 ml of a fluoroacetic 
acid and then added with 20 ml of trifluoroacetic acid anhydride. The 
resulting mixture was refluxed for 30 minutes and then placed under a 
reduced pressure to evaporate a trifluoroacetic acid and trifluoroacetic 
acid anhydride. The residue was dissolved in 500 ml of ethanol. 
Separately, 19.7 g of p-(2,5-diacetoxyphenethyl)-aniline hydrochloride was 
added with 200 ml of water and 20 ml of 35% hydrochloric acid. While the 
resulting mixture was stirred at 0.degree.-3.degree. C., 20 ml of an 
aqueous solution containing 4.1 g of sodium nitrite was added dropwise 
thereto. After stirring at 0.degree. C. for 30 minutes, the resulting 
mixture was added with 0.4 g of a sulfamic acid and then with 30.0 g of 
sodium acetate to prepare an aqueous solution of a 
p-(2,5-diacetoxyphenethyl)-benzene diazonium salt. 
This aqueous diazonium salt solution was added into the above-mentioned 
ethanol solution at below 5.degree. C. Then, the resulting mixture was 
added with 300 ml of an aqueous saturated sodium bicarbonate solution and 
stirred for one hour while the temperature was allowed to increase up to a 
room temperature. The resulting oily material was extracted with ethyl 
acetate, washed with water and dried. Then, ethyl acetate was evaporated 
under a reduced pressure. The residue was purified by means of silica gel 
column chromatography and reprecipitated from benzene/n-hexane to prepare 
a crystalline mass. It was collected by filtration and dried to obtain 
19.6 g of yellow crystals (compound (a)) having m.p. 80.degree.-83.degree. 
C. 
5.0 g of compound (a) thus prepared was dissolved into 200 ml of ethanol 
and the solution was added under a nitrogen atmosphere with 10 ml of 
degassed 25% sodium hydroxide. The mixture was stirred at a room 
temperature for one hour and then neutralized with 2 N hydrochloric acid. 
The product was extracted with ethyl acetate, water-washed and dried. 
After ethyl acetate was evaporated under a reduced pressure, the residue 
was purified by means of silica gel column chromatography, reprecipitated 
from ethyl acetate/n-hexane to prepare 2.6 g of reddish orange crystals 
having m.p. 206.degree.-208.degree. C. 
SYNTHESIS EXAMPLE 6 
Preparation of compound (40) 
Compound (b) as referred herein is 
3-[(N-trifluoroacetyl-p-(chloroanilino)]-4-[p-(2',5'-diacetoxyphenethyl)ph 
enylazo]phenol. 
The same procedures for preparation of compound (a) were repeated except 
for using 3-[4-chloroanilino]-phenol instead of 3-hydroxydiphenylamine, 
thereby to prepare compound (b) having m.p. 65.degree.-69.degree. C. Then, 
the same procedures for preparation of compound (39) were repeated except 
for using compound (b) instead of compound (a), thereby to prepare 
compound (40) having m.p. 184.degree.-186.degree. C. and .lambda..sub.max 
443 nm (in methanol). 
SYNTHESIS EXAMPLE 7 
Preparation of compound (66) 
4.0 g (12 m.mole) of p-(2,5-diacetoxyphenethyl)-aniline hydrochloride was 
dissolved into 100 ml of an aqueous solution containing 2 ml of 
concentrated hydrochloric acid. 10 ml of an aqueous solution containing 
0.8 g (12 m. mole) of sodium nitrite was added dropwise thereinto at 
0.degree.-5.degree. C. while stirring. After 30 minutes, the solution was 
added with 100 mg of sulfamic acid and then added with 2 g of sodium 
acetate to make the solution weakly acidic. 
Separately, 200 ml of an ethanol solution containing 2.9 g (12 m. mole) of 
3-ethoxy-4,4'-dimethyldiphenylamine was added with the aforesaid 
diazotized solution at 0.degree. C. and added further with saturated 
sodium bicarbonate to make its pH weakly alkaline. Then, the solution was 
stirred for two hours at a room temperature, extracted with ethyl acetate, 
washed with water and dried. After the solvent was evaporated, the 
recrystallization from benzene-methanol was carried out to prepare 5.6 g 
of red crystals having m.p. 148.5.degree.-150.0.degree. C. Yield of 83%, 
.lambda..sub.max 469 nm (in methanol). 
SYNTHESIS EXAMPLE 8 
Preparation of compound (67) 
3.0 g (5.3 m. mole) of compound (66) was dispersed into 60 ml of methyl 
cellosolve and the mixture was added with 6 ml of 25% sodium hydroxide 
under a nitrogen atmosphere. The resulting mixture was stirred at a room 
temperature for two hours, then neutralized with 2 N hydrochloric acid, 
and subjected to extraction with ethyl acetate, followed by water-washing 
and drying. The ethylacetate solution was concentrated, then poured into 
n-hexane to obtain 1.7 g of a red material having m.p. 
115.degree.-120.degree. C. and filtered. The filtrate was further 
concentrated and reprecipitated to yield 0.6 g of the above-mentioned 
material. Total 2.3 g. Yield of 88%. m.p. 115.degree.-120.degree. C. 
.lambda..sub.max 468 nm (in methanol). 
According to such processes as shown in the above synthesis examples, 
various kinds of monoazo type dye developers can be prepared. Among the 
monoazo type dye developers thus prepared, compounds (1) to (63) were 
subjected to elementary analyses to show the results in the following 
table: 
______________________________________ 
Elementary Analysis Value (%) 
Exemplified 
Calculated Found 
Compound C H N C H N 
______________________________________ 
1 71.67 5.35 12.38 71.55 5.37 12.36 
2 71.67 5.35 12.38 71.57 5.36 12.35 
3 71.67 5.35 12.38 71.72 5.31 12.42 
4 72.08 5.62 12.01 71.89 5.48 12.11 
5 66.43 5.41 9.39 66.28 5.45 9.52 
6 62.81 4.95 8.88 62.96 4.78 8.80 
7 66.11 5.36 10.28 65.91 5.54 10.10 
8 70.81 5.28 9.18 70.62 5.56 9.20 
9 72.48 5.87 11.66 72.58 6.05 11.55 
10 65.12 5.08 8.14 65.41 5.28 7.87 
11 66.36 5.93 9.99 66.06 6.13 9.88 
12 68.24 4.96 7.96 68.90 5.08 7.69 
13 66.60 4.76 11.51 66.38 5.02 11.35 
14 65.18 4.66 14.08 64.93 4.90 13.98 
15 78.62 5.75 8.87 78.39 5.60 9.05 
16 66.67 4.51 7.52 67.00 4.62 7.48 
17 66.60 4.76 11.51 66.51 4.91 11.68 
18 65.18 4.66 14.08 65.32 4.49 13.93 
19 67.99 5.34 17.90 66.82 5.22 17.77 
20 67.28 4.71 13.08 67.49 4.52 13.17 
21 67.87 5.14 15.32 68.02 5.01 15.52 
22 69.22 4.65 10.76 68.99 4.39 10.70 
23 72.08 5.62 12.01 72.17 5.46 11.88 
24 65.75 5.52 7.67 65.84 5.29 7.45 
25 69.06 5.59 11.50 68.78 5.62 11.44 
26 74.15 6.00 9.26 73.87 6.13 9.33 
27 68.92 5.37 8.61 68.87 5.43 8.57 
28 60.47 4.55 12.16 60.52 4.63 12.06 
29 58.71 4.64 8.06 58.82 4.37 8.26 
30 74.98 5.34 10.60 74.73 5.09 10.90 
31 69.22 5.16 11.96 69.09 5.44 11.69 
32 74.09 5.22 11.15 73.88 5.45 11.08 
33 72.71 5.08 14.13 72.65 4.98 14.32 
34 62.03 4.55 11.30 62.18 4.75 11.08 
35 68.86 5.08 12.17 68.65 5.29 12.08 
36 68.82 5.46 10.85 68.95 5.72 10.67 
37 59.31 4.80 9.88 59.58 4.76 9.69 
38 66.37 4.71 11.91 66.21 4.90 11.68 
39 73.40 5.45 9.88 73.11 5.36 9.77 
40 67.90 4.82 9.14 67.98 4.83 9.01 
41 66.23 4.82 7.72 66.41 4.89 7.67 
42 70.71 5.34 8.25 71.00 5.43 8.37 
43 73.79 5.73 9.56 74.81 5.79 9.61 
44 66.27 4.76 8.28 66.02 4.54 8.11 
45 63.16 4.92 7.89 63.35 5.04 7.62 
46 61.25 4.83 8.66 61.47 5.01 8.43 
47 64.48 4.61 11.14 64.62 4.78 11.02 
48 72.41 6.28 8.44 72.33 6.44 8.25 
49 66.19 4.94 8.58 66.38 4.99 8.31 
50 70.65 4.74 8.24 70.40 4.69 8.15 
51 61.74 4.51 9.29 61.71 4.48 9.29 
52 64.20 5.05 9.36 64.39 5.12 9.45 
53 68.19 5.19 12.43 68.42 5.30 12.42 
54 61.63 4.69 15.72 61.69 4.68 15.74 
55 68.17 6.10 10.60 68.29 6.18 10.82 
56 66.94 4.99 11.56 66.91 4.89 11.67 
57 67.43 5.16 11.56 67.55 5.23 11.62 
58 66.54 5.58 11.76 66.62 5.63 11.83 
59 67.16 4.51 10.44 67.30 4.65 10.51 
60 73.30 5.13 8.55 73.51 5.04 8.70 
61 70.65 4.74 8.24 70.89 4.97 8.06 
62 73.30 5.13 8.55 73.46 5.02 8.49 
63 71.93 5.39 8.99 71.68 5.32 9.07 
64 67.00 4.82 8.37 66.85 4.67 8.51 
65 67.92 4.27 7.42 68.05 4.13 7.53 
66 72.19 6.24 7.43 72.33 6.12 7.26 
67 74.81 6.49 8.73 74.63 6.68 8.59 
______________________________________ 
In order to form a dye image by using the thus prepared monoazo type dye 
developer in this invention, it is preferable to employ a color diffusion 
transfer process, but it may also be possible, if desired, to employ a 
silver dye bleach process which said monoazo type dye is incorporated into 
a photosensitive element or a developer. According to a diffusion transfer 
dye image forming process, a positive dye image can be prepared on an 
image-receiving element, and at the same time, a negative dye image can be 
prepared in a light-sensitive element which image is made solely of dyes 
by desilvering the light-sensitive element. Further, a monochromatic dye 
image or a bichromatic dye image for e.g. pseudo-color photograph can be 
prepared by using one or two pairs of combinations of a silver halide 
emulsion and the monoazo type dye developer. The photographic materials to 
which this invention may be applied include, in addition to the 
photographic materials for color diffusion transfer process, negative, 
reversal or direct positive films and papers of the so-called Kodacolor or 
Kodachrome type. The photographic material having more preferable effect 
in the invention, however, is a color diffusion transfer photographic 
material. 
The color diffusion transfer photographic material comprises a photographic 
element containing a light-sensitive silver halide emulsion and an 
image-receiving element which is dyeable. 
The photographic element usable in the invention contains a silver halide 
emulsion and a dye image-forming material. 
The silver halide emulsion is a hydrophilic colloidal dispersion of silver 
bromide, silver iodide, silver chloride, silver iodobromide, silver 
chlorobromide, silver chloroiodide, silver chloroiodobromide or a mixture 
of these silver halides and the silver halide emulsion may include, in 
addition to an ordinary emulsion, such emulsions prepared in various 
processes as the so-called conversion emulsion, the Lippmann emulsion and 
the direct positive emulsions prefogged or of the internal latent image 
type. And, the grain size, the contents, the proportion or the like of 
silver halides varies according to the kind of the light-sensitive 
photographic materials to be used. 
As a hydrophilic protective colloid in which silver halide grains are 
dispersed, natural or synthetic colloidal materials such as gelatin, 
gelatin derivatives and polyvinyl alcohols are used singly or in 
combination. 
The above-mentioned silver halides can be chemically sensitized with active 
gelatin, sulfur sensitizers such as allylthiocarbamide, thiourea and 
cystine, selen sensitizers, noble metal sensitizers or such sensitizer as 
gold, ruthenium, rhodium and iridium sensitizers, singly or in appropriate 
combination. The silver halides, further, can be optically sensitized with 
such as a cyanine dye or a merocyanine dye. Generally, three kinds of the 
silver halide emulsions which differ in their respective light-sensitive 
wavelength region can be used to prepare a light-sensitive color 
photographic material. 
The silver halide emulsion, moreover, can be stabilized with triazoles, 
tetrazoles, imidazoles, azaindenes, quaternary benzothiazolium compounds, 
zinc compounds or cadmium compounds and can also contain a sensitizing 
compound of a quaternary ammonium salt type or polyethyleneglycol type. 
Furthermore, the silver halide emulsion can contain various photographic 
additives including such suitable plasticizer for gelatin as glycerol, 
dihydroxyalkanes like 1,5-pentadiol, ethylenebisglycolic acid esters, 
bis-ethoxy-diethyleneglycolsuccinates, acrylic amide latices, such gelatin 
hardener as formaldehyde, halogen-substituted aliphatic acids like 
formaldehyde and mucobromic acid, compounds having an acid anhydride 
group, dicarboxylic acid chlorides, biesters of methanesulfonic acid, 
sodium bisulfite derivatives of an dialdehyde in which aldehyde groups are 
separated by 2 to 3 carbon atoms, such coating aid as saponin, and such 
coating aid as sulfosuccinate. Furthermore, various other additives 
ordinarily used for photography, such as anti-fogging agents and 
ultraviolet absorbing agents, can also be contained in the silver halide 
emulsion, if necessary. 
The photographic element comprises the combination of the aforesaid silver 
halide emulsion and a dye developer. By using one or two pairs of said 
combinations, a monochromatic dye image or a bichromatic dye image for 
e.g. pseudo-color photograph can be obtained. Further, for example, in 
case of being used for a color diffusion transfer process according to a 
multichromatic color subtractive process, a blue light-sensitive silver 
halide emulsion, a green light-sensitive silver halide emulsion and a red 
light-sensitive silver halide emulsion are respectively combined with a 
yellow dye developer, a magenta dye developer and a cyan dye developer. 
The preferable layer arrangement comprises a blue light-sensitive 
emulsion, a green light-sensitive emulsion and a red light-sensitive 
emulsion being coated successively from the exposure side. In this 
arrangement, a yellow filter layer may be placed between a blue 
light-sensitive emulsion and a green light-sensitive emulsion. While the 
respective combinations of the light-sensitive silver halide emulsions and 
the dye developers may be carried out in such way as to respectively add 
them into the different layers adjacent to the emulsion layers or to add 
them into the corresponding silver halide emulsion layers respectively. 
The former way is better to obtain natural color photograph. 
Further, two or three of the combinations of the silver halide emulsions 
and the dye developers can be coated in the same layer according to such 
mixed packet process as disclosed in U.S. Pat. No. 2,800,458. 
The dye developer used in this invention is dissolved with as small an 
amount of an organic solvent as possible and dispersed into a hydrophilic 
protective colloid, such as gelatin or polyvinylalcohol. As said organic 
solvent, a high boiling solvent, a low boiling solvent which can be 
removed by evaporation from the dispersion, or an organic solvent easily 
soluble in water can be used singly or in combination. 
The examples of a particularly preferred high boiling solvent in the 
invention include N-n-butylacetoanilide, diethyllaurylamide, dibutyl 
phthalate and tricresyl phosphate. As the low boiling solvent, ethyl 
acetate, methyl acetate, cyclohexanone and the like are useful. These low 
boiling solvents can be removed by evaporation at the time of drying after 
it is coated in a layer, or in such process as disclosed in U.S. Pat. No. 
2,801,171. 
As an easily water-soluble organic solvent, 2-methoxyethanol, 
dimethylformamide and the like can be used. 
Further, instead of or in addition to said high boiling solvent, various 
kinds of lipophilic polymers can be used. Such polymers include, for 
example, polyvinylacetate, polyacrylicesler, and polyester of polyhydric 
alcohol and polybasic acid. 
Such processes as disclosed in Japanese Patent Publication Nos. 13,837/68 
and 32,131/73, U.S. Pat. No. 3,832,173 and Japanese Laid-open-to-public 
Patent Publication No. 17,637/75 are useful in this invention to disperse 
a dye developer. 
Such dye developer as having a carboxyl group or a water-soluble group like 
a sulfo group may be dissolved into water or an alkaline aqueous solution 
and then dispersed into a hydrophilic protective colloid or, if desired, 
neutralized. 
While the amount of the dye developer used in the invention can be varied 
widely according to the kind of compounds to be used and to the desired 
purpose, it is preferable, for example, to use about 0.5 to about 10 wt. % 
of the dye developer in an water-soluble organic colloid coating solution. 
In case of carrying out a multi-color diffusion transfer process, it is 
advantageous to use an inter layer in the photographic element. The inter 
layer comprises, a hydrophilic polymer such as gelatin, polyacrylamide, 
calcium alginate, partial hydralizate of polyvinylacetate and 
hydroxypropylcellulose, and further such a porous polymer formed from a 
latex of a hydrophilic polymer and a hydrophobic polymer as disclosed in 
U.S. Pat. No. 3,625,685. 
Such compounds as disclosed in U.S. Pat. Nos. 3,384,483, 3,421,892, 
3,427,158, 3,121,011, 3,043,692, 3,069,263, 3,615,422, 3,625,685, 
3,756,816 and 3,069,214 can be also used as the inter layer. 
As a support of the photographic element in the invention, various natural 
or synthetic polymeric materials such as paper, glass, cellulose nitrate, 
cellulose acetate, polyvinylacetal, polycarbonate, polystyrene, 
polyethylene terephthalate, polypropylene and polyethylene can be also 
used and they may be either transparent or opaque according to the 
intended use purpose. 
Such vapor-permeable support or oxygen barrier support as disclosed in U.S. 
Pat. No. 3,573,044 can also be advantageously used. In case of a 
transparent support, it is preferred that the said support is colored to 
such an extent as not to prevent the exposure and the visual observation 
of formed images but as to inhibit the emulsion layer from being fogged 
with light piping coming into the emulsion layer from the sides of the 
support. 
It is preferable that the image receiving element contains a mordant. The 
mordant suitable to the image receiving element may be any of those which 
have preferable mordanting effect on a diffusible dye developer on the way 
of diffusion transfer. The useful examples of the said mordant are 
poly-4-vinylpyridine, poly-4-vinyl-N-benzylpyridinium-p-toluenesulfonate 
and cetyl trimethylammonium bromide. 
Such mordants as disclosed in U.S. Pat. No. 2,882,156, Belgian Pat. No. 
729,202, U.S. Pat. Nos. 3,488,706, 3,859,096, 3,788,855, 3,227,148, 
3,271,147, 3,709,690, 3,625,694, 3,770,439 and 3,756,814, and Japanese 
Laid-open-to-public Publication No. 61,228/75 can be used advantageously 
in this invention. 
While the above-mentioned mordants are usually used in various binders such 
as gelatin, polyvinylalcohol, polyvinylpyrrolidone and completely or 
partially hydrolyzed cellulose ester, such binder as 
poly-N-methyl-2-vinylpyridine, N-methoxy-methyl-poly-hexamethylene 
adipamide, a copolymer or polymeric mixture of vinylalcohol and 
N-vinylpyrrolidone, partially hydrolyzed polyvinylacetate, 
acetylcellulose, gelatin, polyvinylalcohol or a guanylhydrazone derivative 
of an acylstyrene polymer can be used as a binder for an image receiving 
without the above-mentioned mordants since these have an ability of 
mordanting. 
Such special case that the mordant is contained in an alkaline processing 
solution is possible as disclosed in Japanese Laid-open-to-public 
Publication No. 47,626/75. 
The image receiving element can contain also various additives ordinarily 
used for the photography, such as an ultraviolet absorbing agent or a 
fluorescent whitening agent. 
After the formation of a dye image is substantially completed after the 
diffusion transfer of diffusible dyes into the image receiving element 
resulting from application of an alkaline processing solution, it is 
preferred to reduce a pH value within a film unit to about neutrality so 
as to increase the stability of a dye image and substantially to stop 
further image formation in order to avoid a change or stain in the image 
which change or stain occurs at high pH. In view of this, it is 
advantageous to use an neutralizing layer containing such material as 
capable of reducing pH sufficiently. The useful examples of said material 
used in the invention are such polymeric acids or partial esters and acid 
anhydrides thereof as disclosed in U.S. Pat. No. 3,362,819, such higher 
aliphatic acids as disclosed in U.S. Pat. No. 2,983,606, and such solid 
acid metal salts as disclosed in U.S. Pat. No. 2,584,030. 
Microcapsulization as disclosed in U.S. Pat. No. 3,576,625 can be also 
carried out. 
It is, moreover, preferred to use a spacer layer in order to control a pH 
reducing rate. As a material for said spacer layer, for example, gelatin, 
hydroxypropylcellulose, partially hydrolyzed polyvinylacetateacryllatex, 
polyacrylamide, polyvinylalcohol, partially acetalized polyvinylalcohol 
and the mixtures of these compounds. 
The alkaline processing solution used in the invention contains such 
ingredients as necessary to develop a silver halide emulsion and to form 
diffusible dyes and has strong alkalinity, generally over pH 10. 
The alkaline processing solution used in the invention contains an alkali 
metal or alkali earth metal hydroxide, such as sodium hydroxide, calcium 
hydroxide, potassium hydroxide or lithium hydroxide, or sodium carbonate, 
diethylamine or the like. Further, the processing solution can be added 
with such development restrainer as benzotriazole or with such thickner as 
hydroxyethylcellulose or a sodium carboxymethylcellulose salt. It is 
desirable in the invention to add such onium compound as quaternary 
ammonium salt into the processing solution. While the typical examples of 
the particularly preferred onium compound are 1-benzyl-2-picolium bromide 
and 1-phenethyl-2-picolium bromide, such onium compounds as disclosed in 
U.S. Pat. Nos. 3,411,904 and 3,173,786 can be also used in the invention. 
While the above-mentioned alkaline processing solution can be applied in 
various forms to the photographic element, it is preferable to hold the 
processing solution in a rupturable container so that, after the 
photographic element is exposed, the said solution is applied to the 
exposed photographic element by destroying the rupturable container by 
means of pressing members placed inside of a camera and/or a film unit 
cartridge. 
As the rupturable container, such containers as disclosed in U.S. Pat. Nos. 
2,543,181, 2,643,886, 2,723,051, 3,056,492 and 3,152,515 can be used. 
It is possible that a development restrainer such as 
1-phenyl-5-mercaptotetrazole or benzylaminopurine can be contained in any 
one of the photographic element, the image receiving element and the 
processing solution. It is advantageous in the invention to contain an 
auxiliary developing agent, such as a hydroquinone derivative like 
p-tolylhydroquinone, a catechol derivative or 1-phenyl-3-pyrazolidone, in 
any one of the photographic element, the image receiving element and the 
processing solution. The examples of the auxiliary developing agent used 
advantageously in the invention include any of those as disclosed in 
Japanese Patent Publication No. 17,383/60, U.S. Pat. Nos. 2,939,788, 
3,192,044 and 3,462,266, British Pat. No. 1,243,539 and Japanese 
Laid-open-to-public Patent Publication Nos. 40,128/74, 83,440/74, 
84,238/74 and 6,340/75. A process for adding the auxiliary developing 
agent to the photographic element or the image receiving element can be 
carried out according to such process as used for dispersing the aforesaid 
dye developer. The auxiliary developing agent may be also contained in the 
form of uniform distribution in the image receiving element, as disclosed 
in Japanese Laid-open-to-public Patent Publication No. 131,134/74. 
The film unit used in the invention may be either a film unit in which the 
photographic element and the image receiving element are placed separately 
or a film unit comprising both integrally before the exposure. After 
processing, the photographic element and the image receiving element may 
be kept unitedly or stripped off. In case of using a film unit in which 
the photographic element and the image receiving element are placed 
separately before exposure or in which both are stripped off after 
processing, it is required to form the both elements on the respective 
supports. 
The support of the image receiving element can be such as used in the case 
of the photographic element and may be either transparent or opaque 
according to the purpose. 
The image receiving element can be also formed on a support in the 
photographic element. In this case, it is preferable to use a cover sheet 
which is placed on the top as disclosed in U.S. Pat. Nos. 3,594,164 and 
3,594,165. 
The background for a formed image is preferably a light reflecting layer 
having high whiteness. While the position of the light reflecting layer is 
not particularly limited, it is, however, better to form the light 
reflecting layer between the photographic element and the image receiving 
layer in case of not stripping off the both elements after processing. The 
light reflecting layer may be formed beforehand or formed at the time of 
processing by incorporating a light reflecting agent in the alkaline 
processing solution. 
As the light reflecting agent, titanium dioxide, zinc oxide, barium 
sulfate, flaked silver, alumina, barium stearate or zirconium oxide can be 
used singly or in combination of more than two kinds of these compounds. 
In case of forming the light reflecting layer beforehand, the light 
reflecting agent may be dispersed into any binder capable of forming an 
alkaline liquid-permeable layer, such as gelatin or polyvinylalcohol. 
Such processes as disclosed in Japanese Laid-open-to-public Publication 
Nos. 486/71 and 477/72 may be used as a process for forming the light 
reflecting layer. 
Into the aforesaid light reflecting layer, a whitening agent such as a 
stilbene or coumarin may be added. In case of developing the silver halide 
emulsion outside a camera after exposure, it is desirable to use an 
opacifying layer in order to shelter the silver halide emulsion from 
light. The opacifying layer may be formed beforehand as a layer or formed 
at the time of processing. 
As the opacifying agent, carbon black or such indicator dyes as disclosed 
in Japanese Laid-open-to-Public Patent Publication Nos. 26/72, 27/72 and 
28/72 can be used. Further, it is advantageous to use such desensitizers 
as disclosed in U.S. Pat. No. 3,579,333. 
The aforesaid light reflecting layer and the opacifying layer may 
constitute the same layer or the mutually adjacent layers. 
Various ways to arrange the layers in the film unit may be employed and 
there may be used in the invention such film units as disclosed in U.S. 
Pat. Nos. 3,415,644, 3,415,645, 3,415,646, 3,473,925, 3,573,042, 
3,543,043, 3,594,164, 3,594,165, 3,615,421, 3,576,626, 3,658,524, 
3,635,707, 3,672,890, 3,730,718, 3,701,656 and 3,689,262, Japanese 
Laid-open-to-public Patent Publication No. 6,337/75, and Belgian Pat. Nos. 
757,959 and 757,960. 
In the above-mentioned film units, such filter dye as suitable for 
improvement of desired photographic properties may be added to any 
position on an exposure side for the silver halide emulsion layer. As the 
filter dye, such dye as stable at usual pH but discolored due to the 
decomposition or the like in contact with the alkaline processing solution 
can be also used. 
After a dye image is diffusion-transferred into the image receiving 
element, there remains in the photographic element the silver image and 
the image due to dye or dye precursor, both being reversally corresponding 
to the diffusion transfer image. If these remaining silver and silver 
halide are removed by processing with a bleaching solution and a fixing 
solution or with a bleaching-fixing solution and, if desired, further 
processing for converting the dye precursor into dye is carried out, there 
can be prepared the dye image reverse to that formed on the image 
receiving layer.

The present invention will be illustrated with reference to the following 
examples but the invention is not intended to be limited thereto. An 
experiment for demonstrating advantages of the invention was also 
conducted, which will be explained before the example. 
&lt;EXPERIMENT&gt; 
Element 1 was prepared by coating a below-mentioned solution on a 
transparent cellulose triacetate film having a gelatin-subbed layer 
thereon. 
The solution was prepared by dissolving 0.15 g of compound (39) into 0.3 
ml. of N,N-diethyllaurylamide and 0.6 ml. of ethyl acetate, adding, at 
40.degree. C., the resulting solution into 10 ml. of an aqueous 3% gelatin 
solution containing 1.0 ml. of an aqueous 3.5% Alkanol B (produced by Du 
Pont de Nemours Co.) solution, further adding into the resulting mixture 
1.0 ml. of an aqueous 10% di-2-ethylhexylsuccinosulfonate solution and 
then dispersing the mixture thus prepared by means of a supersonic 
dispersing device for one minute. 
Control elements A and B were respectively prepared in the exactly same 
manner except for using the control compounds of the following formulae 
[A] and [B] instead of compound (39). 
Control Compound [A]: 
##STR2## 
Control Compound [B]: 
##STR3## 
Each of the three elements were exposed to a Xenon Fademeter under such 
conditions as the temperature of 50.degree. C. and the relative humidity 
of 60% respectively for 5, 24 and 48 hours. After exposure, a transmission 
density of each element was measured by means of Sakura Color Densitometer 
PD-6 Type (produced by Konishiroku Photo Industry Co.). The results were 
shown in Table 1 where the dye amount prior to exposure was rated as the 
standard 100. 
Table 1 
______________________________________ 
Exposure (hrs) 
Element 0 5 24 48 
______________________________________ 
I 100 100 98 96 
Control A 100 93 90 82 
Control B 100 95 92 86 
______________________________________ 
As obvious from Table 1, it was proved that the monoazo type dye developer 
of compound (39) had more excellent light fastness than control compounds 
[A] and [B]. 
Instead of compound (39), compounds (7), (24), (28), (40), (41), (42), 
(44), (45), (49) and (63) were treated in the exactly same manner as 
mentioned above, so that each of compounds showed excellent light 
fastness. 
EXAMPLE 1 
Photographic element 1 was prepared by successively forming the following 
layers on a cellulose triacetate film having a gelatin-subbed layer 
thereon. 
(1) Yellow dye developer layer 
One part of compound (39) was dissolved in a solvent mixture comprising one 
part of N,N-diethyllaurylamide and three parts of ethyl acetate, and the 
resulting solution was emulsified by dispersing it into an aqueous gelatin 
solution containing Alkanol B as a surfactant. The emulsified dispersion 
was coated on the subbed film and dried so that the amounts of compound 
(39), N,N-diethyllaurylamide and gelatin were respectively 1.3 g/m.sup.2, 
1.3 g/m.sup.2 and 2.5 g/m.sup.2 in the resulting layer. 
(2) Blue light-sensitive emulsion layer 
A blue light-sensitive silver iodobromide emulsion was coated on the yellow 
dye developer layer so that the amounts of silver and gelatin were 
respectively 2.8 g/m.sup.2 and 3.0 g/m.sup.2. 
(3) Protective layer 
One part of p-tolylhydroquinone was dissolved in a solvent mixture 
comprising one part of dibutylphthalate and 1.7 parts of ethyl acetate and 
the resulting solution was emulsified by dispersing it into an aqueous 
gelatin solution. Then, the emulsified dispersion was added with 
mucochloric acid as a hardener. Then, the coating thereof was carried out 
so that the amounts of p-tolylhydroquinone, dibutylphthalate and gelatin 
were respectively 0.22 g/m.sup.2, 0.22 g/m.sup.2 and 0.5 g/m.sup.2. 
An image receiving element was prepared by successively forming the 
following layers on a baryta paper. 
(1) Neutralizing layer 
A layer having the dry thickness of 20.mu. was formed by coating a 5% 
acetone solution containing half butylester of a maleic anhydride-ethylene 
copolymer. 
(2) Spacer layer 
A layer having a dry thickness of 3.mu. was formed by coating an aqueous 
hydroxypropyl cellulose solution. 
(3) Image receiving layer 
One part of poly-4-vinylpyridine and two parts of polyvinylalcohol were 
dissolved in a mixture comprising a half part of glacial acetic acid and 
150 parts of water, and the resulting solution was added with one 
twentieth part of 1-phenyl-5-mercaptotetrazole. Then, the coating thereof 
was carried out so that the amounts of poly-4-vinylpyridine, 
polyvinylalcohol and 1-phenyl-5-mercaptotetrazole were respectively 3.0 
g/m.sup.2, 6.0 g/m.sup.2 and 0.15 g/m.sup.2. 
In addition to the above photographic element I using compound (39), the 
other photographic elements were also prepared in the same manner as shown 
in the photographic element I except of using the respective compounds 
(40), (41), (42), (44) and (45) instead of compound (39). 
Each of these photographic elements was exposed through a light wedge to 
blue light from the side of the emulsion layer and then the exposed 
photographic element was superposed on the above-mentioned image receiving 
element so that the following alkaline processing solution was spread in 
the thickness of 20.mu. between the photographic element and the image 
receiving element. 
The composition of the alkaline processing solution used was as follows: 
Water: 100 ml 
Potassium hydroxide: 11.2 g 
Carboxymethylcellulose sodium salt: 3.5 g 
Benzotriazole: 2.0 g 
1-Phenethyl-2-picolinium bromide: 2.0 g 
After one minute, the photographic element was peeled off from the image 
receiving element and the maximum density (D.sub.max) and the minimum 
density (D.sub.min) of a yellow dye image prepared on the image receiving 
element were measured by means of a blue filter. 
All of the photographic elements showed such preferable results as 
D.sub.max of 1.5-1.8 and D.sub.min of not more than 0.10. 
EXAMPLE 2 
A photographic element was prepared by successively forming the following 
layers on a opaque polyethyleneterephthalate base: 
(1) Cyan dye developer layer 
1.5-bis-(N-[p-(.beta.-hydroquinonylethyl)phenyl]-N-trifluoroacetamido)-4,8- 
dihydroxyanthraquinone was dissolved in a solvent mixture of 
N,N-diethyllaurylamide and ethyl acetate, and the resulting solution was 
emulsified by dispersing it into an aqueous gelatin solution containing 
Alkanol B as a surfactant. The emulsified dispersion was coated so that 
the respective amounts of gelatin and the dye developer were 4.4 g/m.sup.2 
and 2.3 g/m.sup.2. 
(2) Red light-sensitive emulsion layer 
A red light-sensitive silver iodobromide emulsion was coated so that the 
respective amounts of silver and gelatin were 2.4 g/m.sup.2 and 2.4 
g/m.sup.2. 
(3) Inter layer 
An aqueous gelatin solution was coated so that its amount was 2.0 
g/m.sup.2. 
(4) Magenta dye developer layer 
2-[p-(.beta.-hydroquinonylethyl)phenylazo]-4-n-propoxy-1-acetoxynaphthalene 
was dissolved into a solvent mixture of N,N-diethyllaurylamide and ethyl 
acetate, and the resulting solution was emulsified by dispersing it into 
an aqueous gelatin solution containing Alkanol B as a surfactant. The 
emulsified solution was coated so that the respective amounts of gelatin 
and the dye developer were 2.9 g/m.sup.2 and 1.4 g/m.sup.2. 
(5) Green light-sensitive emulsion layer 
A green light-sensitive silver iodobromide emulsion was coated so that the 
respective amounts of silver and gelatin were individually 1.2 g/m.sup.2. 
(6) Inter layer 
An aqueous gelatin solution was coated so that its amount was 1.5 
g/m.sup.2. 
(7) Yellow dye developer layer 
Compound (39) was dissolved in a N-n-butylacetoanilide and cyclohexanone 
solvent mixture and the resulting solution was emulsified by dispersing it 
into an aqueous gelatin solution containing Alkanol B. The emulsified 
solution was coated so that the amounts of gelatin and the dye developer 
were respectively 1.1 g/m.sup.2 and 0.5 g/m.sup.2. 
(8) Blue light-sensitive emulsion layer 
A blue light-sensitive silver iodobromide emulsion was coated so that the 
respective amounts of silver and gelatin were 0.6 g/m.sup.2 and 0.6 
g/m.sup.2. 
(9) Protective layer 
p-Tolylhydroquinone was dissolved into N,N-diethyllaurylamide and the 
resulting solution was emulsified by dispersing it into an aqueous gelatin 
solution. The emulsified dispersion was coated so that the respective 
amounts of p-tolylhydroquinone and gelatin were 0.5 g/m.sup.2 and 0.6 
g/m.sup.2. 
The image receiving element was prepared in the same manner as in Example 1 
except for using a transparent polyethylene terephthalate base instead of 
the baryta paper. 
The processing solution here used was a mixture comprising the alkaline 
processing solution in Example 1 added further with 40 g of titanium 
dioxide. 
The photographic element thus prepared was exposed through a wedge to blue, 
green and red lights from its emulsion layer side and the above-mentioned 
alkaline processing solution was spread between the photographic element 
and the image receiving element to carry out development. After several 
minutes, the positive transfer image corresponding to the exposed amounts 
of blue, green and red lights could be observed from the support side of 
the image receiving element.