EP1061416A1 - Colour photographic developer concentrate - Google Patents
Colour photographic developer concentrate Download PDFInfo
- Publication number
- EP1061416A1 EP1061416A1 EP00201918A EP00201918A EP1061416A1 EP 1061416 A1 EP1061416 A1 EP 1061416A1 EP 00201918 A EP00201918 A EP 00201918A EP 00201918 A EP00201918 A EP 00201918A EP 1061416 A1 EP1061416 A1 EP 1061416A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- concentrate
- colour
- developer
- hydroxylamine
- comparison
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 239000012141 concentrate Substances 0.000 title claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000003287 optical effect Effects 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 7
- 150000002443 hydroxylamines Chemical class 0.000 claims abstract description 6
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical compound ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 claims abstract description 5
- 150000003839 salts Chemical class 0.000 claims abstract description 5
- 239000003513 alkali Substances 0.000 claims abstract description 4
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 4
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 4
- 239000012928 buffer substance Substances 0.000 claims abstract description 4
- 239000002904 solvent Substances 0.000 claims abstract description 4
- NPKFETRYYSUTEC-UHFFFAOYSA-N n-[2-(4-amino-n-ethyl-3-methylanilino)ethyl]methanesulfonamide Chemical compound CS(=O)(=O)NCCN(CC)C1=CC=C(N)C(C)=C1 NPKFETRYYSUTEC-UHFFFAOYSA-N 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 description 14
- 239000000243 solution Substances 0.000 description 8
- 239000000470 constituent Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 4
- VGYYSIDKAKXZEE-UHFFFAOYSA-L hydroxylammonium sulfate Chemical compound O[NH3+].O[NH3+].[O-]S([O-])(=O)=O VGYYSIDKAKXZEE-UHFFFAOYSA-L 0.000 description 4
- 229910000378 hydroxylammonium sulfate Inorganic materials 0.000 description 4
- 239000002202 Polyethylene glycol Substances 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 3
- 229920001223 polyethylene glycol Polymers 0.000 description 3
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 description 3
- 235000010262 sodium metabisulphite Nutrition 0.000 description 3
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 description 2
- 235000015497 potassium bicarbonate Nutrition 0.000 description 2
- 239000011736 potassium bicarbonate Substances 0.000 description 2
- 229910000028 potassium bicarbonate Inorganic materials 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 239000001103 potassium chloride Substances 0.000 description 2
- 235000011164 potassium chloride Nutrition 0.000 description 2
- TYJJADVDDVDEDZ-UHFFFAOYSA-M potassium hydrogencarbonate Chemical compound [K+].OC([O-])=O TYJJADVDDVDEDZ-UHFFFAOYSA-M 0.000 description 2
- 229940086066 potassium hydrogencarbonate Drugs 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 239000012224 working solution Substances 0.000 description 2
- 125000000008 (C1-C10) alkyl group Chemical group 0.000 description 1
- 229920001174 Diethylhydroxylamine Polymers 0.000 description 1
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- FVCOIAYSJZGECG-UHFFFAOYSA-N diethylhydroxylamine Chemical compound CCN(O)CC FVCOIAYSJZGECG-UHFFFAOYSA-N 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 235000011181 potassium carbonates Nutrition 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
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
- G03C7/407—Development processes or agents therefor
- G03C7/413—Developers
-
- 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
- G03C2200/00—Details
- G03C2200/44—Details pH value
-
- 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
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
- G03C5/264—Supplying of photographic processing chemicals; Preparation or packaging thereof
- G03C5/266—Supplying of photographic processing chemicals; Preparation or packaging thereof of solutions or concentrates
Definitions
- the developer solution for developing colour photographic materials is prepared from or, in the case of continuous operation, replenished with concentrates which contain the necessary constituents.
- one concentrate contains the antioxidant, an auxiliary solvent and an optical brightener
- a second concentrate contains the colour developer substance, for example CD 3 (N-ethyl-N-(2-methylsulfonylaminoethyl)-3-methyl-p-phenylenediamine)
- a third concentrate contains the buffer substance, alkali and a water softener.
- the first concentrate is alkaline (approx. pH 10)
- the second is strongly acidic and thus stable with regard to colour developer concentration
- the third is strongly alkaline.
- a small quantity of sulfite is generally added to the concentrate of the colour developer substance for stabilisation purposes.
- the quantity of sulfite must not be too large as it otherwise has a negative impact on sensitometry (inhibition of development and thus reduction of colour densities).
- Two one-part concentrates are currently commercially available, a) Monoline® RA-4 CD-R from Tetenal, a two-phase concentrate with a solid, undissolved phase deposited at the bottom and b) TriPhase® RA-4 CD-R from Trebla, a three-phase concentrate with undissolved constituents in the middle phase (c.f. also US 5 891 609).
- the object of the invention was to provide a two-part concentrate for a colour developer, neither part of which contains any undissolved constituents, from which parts a regenerating solution may rapidly be produced and which parts comprise a single phase.
- part 1 of the two-part concentrate containing the antioxidant, the auxiliary solvent, the optical brightener, the colour developer substance and 0.001 to 1 mol of hydroxylamine or a monoalkylated hydroxylamine or the salts thereof per litre of concentrate.
- hydroxylamine or monoalkylated hydroxylamine or the salts thereof are used, particularly preferably hydroxylammonium sulfate.
- Monoalkylated hydroxylamine is preferably of the formula HO-NH-R in which
- the colour of the stored concentrates is unchanged in comparison with the fresh preparations.
- a colour developer working solution was then prepared from these concentrates. 35 ml of part 1, 17.5 ml of part 2 and 35 ml of part 3 were used per litre. The pH is adjusted to 10.2 with potassium hydrogen carbonate. 2 g of potassium chloride were added per litre. The preparation is light yellow and clear and thus matches the preparation made from the fresh, unstored concentrates.
- Photographic materials were processed in these two preparations.
- the two processed materials in fresh, unstored concentration or in stored concentrate) exhibit no sensitometric differences (Table 1).
- Part 2 is identical to part 3 of Example 1.
- the colour of the stored concentrate, part 1 is distinctly darkened and deep brown in comparison with the fresh preparations.
- a colour developer working solution was then prepared from these concentrates. 28 ml of part 1 and 35 ml of part 2 were used per litre. The pH is adjusted to 10.2 with potassium hydrogen carbonate. 2 g of potassium chloride are added per litre. The preparation is dark and turbid, while the preparation made from the fresh, unstored concentrates is light in colour and clear.
- Example 2 As Example 2, but the part 1 concentrate is adjusted to pH 3.
- the colour of the stored part 1 concentrate is distinctly darkened and deep brown in comparison with the fresh preparations.
- the preparation is dark and turbid, while the preparation made from the fresh, unstored concentrates is light in colour and clear.
- Example 2 but the sulfite is omitted from the part 1 concentrate.
- the colour of the stored concentrate, part 1 is distinctly darkened and deep brown.
- Example 3 As Example 3, but the sodium disulfite is replaced by 5 g of hydroxylammonium sulfate.
- the colour of the stored concentrate, part 1 is unchanged in comparison with the fresh preparation.
- Example 2 but with 150 g of caprolactam instead of the polyethylene glycol and additionally with 5 g of hydroxylammonium sulfate.
- the colour of the stored concentrate, part 1 is unchanged in comparison with the fresh preparation.
- Part 2 is identical to part 3 of Example 1.
- the colour of the stored concentrate, part 1 is identical to that of the fresh preparation. (Yellow fog of processed material) Yellow D min x 1000 fresh stored Example 1 (Comparison) 114 116 Example 2 (Comparison) 114 137 Example 3 (Comparison) 115 155 Example 4 (Comparison) 113 132 Example 5 (Invention) 114 116 Example 6 (Invention) 113 115 Example 7 (Invention) 114 116 (CD 3 loss due to storage of concentrate for 1 week at 60°C) CD 3 content [g/l] fresh stored Example 1 (Comparison) 5.0 4.8 Example 2 (Comparison) 5.0 4.1 Example 3 (Comparison) 5.0 3.8 Example 4 (Comparison) 5.0 4.3 Example 5 (Invention) 5.0 4.8 Example 6 (Invention) 5.0 4.7 Example 7 (Invention) 5.0 4.9
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
- Cosmetics (AREA)
Abstract
A two-part colour photographic developer concentrate in which part 1 contains at
least one antioxidant, at least one auxiliary solvent, at least one optical brightener and
at least one colour developer substance and part 2 contains at least one buffer
substance, alkali and at least one water softener, may be produced by part 1 additionally
containing 0.001 to 1 mol of hydroxylamine or a monoalkylated hydroxylamine
or the salts thereof per litre of concentrate.
Description
The developer solution for developing colour photographic materials, in particular
for developing colour photographic paper, is prepared from or, in the case of
continuous operation, replenished with concentrates which contain the necessary
constituents.
It is conventional to provide three different concentrates, as certain constituents of
the developer bath are not mutually compatible on extended storage. Thus, for
example, one concentrate contains the antioxidant, an auxiliary solvent and an optical
brightener, a second concentrate contains the colour developer substance, for
example CD 3 (N-ethyl-N-(2-methylsulfonylaminoethyl)-3-methyl-p-phenylenediamine)
and a third concentrate contains the buffer substance, alkali and a water softener.
The first concentrate is alkaline (approx. pH 10), the second is strongly acidic and
thus stable with regard to colour developer concentration and the third is strongly
alkaline. A small quantity of sulfite is generally added to the concentrate of the
colour developer substance for stabilisation purposes. The quantity of sulfite must
not be too large as it otherwise has a negative impact on sensitometry (inhibition of
development and thus reduction of colour densities).
There has been no lack of attempts to develop stable, one-part colour developer
concentrates as handling errors during preparation or replenishing of a developer
solution may consequently be avoided.
Two one-part concentrates are currently commercially available, a) Monoline® RA-4
CD-R from Tetenal, a two-phase concentrate with a solid, undissolved phase deposited
at the bottom and b) TriPhase® RA-4 CD-R from Trebla, a three-phase
concentrate with undissolved constituents in the middle phase (c.f. also US 5 891 609).
In both cases, the presence of undissolved constituents is disadvantageous for the
purposes of handling the concentrate. Especially when preparing the regenerating
solution, problems may occur because the undissolved constituents dissolve only
poorly.
The object of the invention was to provide a two-part concentrate for a colour
developer, neither part of which contains any undissolved constituents, from which
parts a regenerating solution may rapidly be produced and which parts comprise a
single phase.
This object is achieved by part 1 of the two-part concentrate containing the antioxidant,
the auxiliary solvent, the optical brightener, the colour developer substance
and 0.001 to 1 mol of hydroxylamine or a monoalkylated hydroxylamine or the salts
thereof per litre of concentrate.
Preferably, 0.005 to 0.3 mol of hydroxylamine or monoalkylated hydroxylamine or
the salts thereof are used, particularly preferably hydroxylammonium sulfate.
Monoalkylated hydroxylamine is preferably of the formula
HO-NH-R
in which
- R
- means C1-C10-alkyl, hydroxy-C1 -C10-alkyl, C1-C10-alkoxy-C1 -C10-alkyl, carboxy-C2-C10-alkyl, dicarboxy-C1 -C10-alkyl, carboxyhydroxy-C1 -C10-alkyl, hydroxy-C1 -C5-alkyl-(oxy-C1 -C5-alkyl)n, C1 -C5-alkoxy-C1 -C5-alkyl-(oxy-C1-C5-alkyl)n or aryl and
- n
- means a number from 1 to 4.
The following Examples describe concentrated (parts 1, 2 and 3, or parts 1 and 2),
from which developer solutions were prepared in the stated manner. A portion of
each of the concentrates was stored for 1 week at 60°C before use and then compared
with the freshly produced concentrates. Table 1 shows the differences in yellow fog
of a material based on silver chloride emulsions which was processed with these
developer solutions.
| Polyethylene glycol, average MW 400 | 300 ml |
| Diethylhydroxylamine, 85 wt.% aqueous solution (DEHX solution) | 120 ml |
| Optical brightener | 20 g |
| Water to make up to | 1000 ml |
| pH 10 |
| CD 3 | 280 g |
| Sodium disulfite | 10 g |
| Water to make up to | 1000 ml |
| pH 1 |
| Potassium hydroxide | 65 g |
| Potassium carbonate | 600 g |
| EDTA | 3 g |
| Water to make up to | 1000 ml |
| pH 14 |
The colour of the stored concentrates is unchanged in comparison with the fresh
preparations.
A colour developer working solution was then prepared from these concentrates.
35 ml of part 1, 17.5 ml of part 2 and 35 ml of part 3 were used per litre. The pH is
adjusted to 10.2 with potassium hydrogen carbonate. 2 g of potassium chloride were
added per litre. The preparation is light yellow and clear and thus matches the
preparation made from the fresh, unstored concentrates.
Photographic materials were processed in these two preparations. The two processed
materials (in fresh, unstored concentration or in stored concentrate) exhibit no
sensitometric differences (Table 1).
In this Example, parts 1 and 2 from Example 1 were combined to form a new part 1
of the following composition. Since not all the substances from part 1 of Example 1
dissolve at pH 1, the pH value was raised.
Part 2 is identical to part 3 of Example 1.
| Polyethylene glycol of an average MW of 400 | 375 ml |
| DEHX solution | 150 ml |
| Optical brightener | 25 g |
| CD 3 | 250 g |
| Sodium disulfite | 6.2 g |
| Water to make up to | 1000 ml |
| pH 5 |
The colour of the stored concentrate, part 1, is distinctly darkened and deep brown in
comparison with the fresh preparations.
A colour developer working solution was then prepared from these concentrates.
28 ml of part 1 and 35 ml of part 2 were used per litre. The pH is adjusted to 10.2
with potassium hydrogen carbonate. 2 g of potassium chloride are added per litre.
The preparation is dark and turbid, while the preparation made from the fresh,
unstored concentrates is light in colour and clear.
As Example 2, but the part 1 concentrate is adjusted to pH 3.
The colour of the stored part 1 concentrate is distinctly darkened and deep brown in
comparison with the fresh preparations.
The preparation is dark and turbid, while the preparation made from the fresh,
unstored concentrates is light in colour and clear.
As Example 2, but the sulfite is omitted from the part 1 concentrate.
The colour of the stored concentrate, part 1, is distinctly darkened and deep brown.
As Example 3, but the sodium disulfite is replaced by 5 g of hydroxylammonium
sulfate.
The colour of the stored concentrate, part 1, is unchanged in comparison with the
fresh preparation.
As Example 2, but with 150 g of caprolactam instead of the polyethylene glycol and
additionally with 5 g of hydroxylammonium sulfate.
The colour of the stored concentrate, part 1, is unchanged in comparison with the
fresh preparation.
| Triethanolamine | 250 ml |
| HADS | 120 g |
| Optical brightener | 25 g |
| CD 3 | 250 g |
| Hydroxylammonium sulfate | 5 g |
| Water to make up to | 1000 ml |
| pH 3 |
Part 2 is identical to part 3 of Example 1.
The colour of the stored concentrate, part 1, is identical to that of the fresh
preparation.
| (Yellow fog of processed material) | ||
| Yellow Dmin x 1000 | ||
| fresh | stored | |
| Example 1 (Comparison) | 114 | 116 |
| Example 2 (Comparison) | 114 | 137 |
| Example 3 (Comparison) | 115 | 155 |
| Example 4 (Comparison) | 113 | 132 |
| Example 5 (Invention) | 114 | 116 |
| Example 6 (Invention) | 113 | 115 |
| Example 7 (Invention) | 114 | 116 |
| (CD 3 loss due to storage of concentrate for 1 week at 60°C) | ||
| CD 3 content [g/l] | ||
| fresh | stored | |
| Example 1 (Comparison) | 5.0 | 4.8 |
| Example 2 (Comparison) | 5.0 | 4.1 |
| Example 3 (Comparison) | 5.0 | 3.8 |
| Example 4 (Comparison) | 5.0 | 4.3 |
| Example 5 (Invention) | 5.0 | 4.8 |
| Example 6 (Invention) | 5.0 | 4.7 |
| Example 7 (Invention) | 5.0 | 4.9 |
It is evident that only the two-part concentrates according to the invention achieve the
performance of the three-part concentrate with regard to yellow fog and stability.
Claims (4)
- Two-part colour photographic developer concentrate in which part 1 contains at least one antioxidant, at least one auxiliary solvent, at least one optical brightener and at least one colour developer substance and part 2 contains at least one buffer substance, alkali and at least one water softener, characterised in that part 1 additionally contains 0.001 to 1 mol of hydroxylamine or a monoalkylated hydroxylamine or the salts thereof per litre of concentrate.
- Developer concentrate according to claim 1, characterised in that part 1 additionally contains 0.005 to 0.3 mol of hydroxylamine or a monoalkylated hydroxylamine or the salts thereof per litre of concentrate.
- Developer concentrate according to claim 1, characterised in that part 1 contains N-ethyl-N-(2-methylsulfonylaminoethyl)-3-methyl-p-phenylenediamine as colour developer substance.
- Developer concentrate according to claim 1, characterised in that part 1 has a pH of 1.5 to 6.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19927601 | 1999-06-17 | ||
| DE19927601A DE19927601A1 (en) | 1999-06-17 | 1999-06-17 | Color photographic developer concentrate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1061416A1 true EP1061416A1 (en) | 2000-12-20 |
Family
ID=7911519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00201918A Ceased EP1061416A1 (en) | 1999-06-17 | 2000-05-29 | Colour photographic developer concentrate |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1061416A1 (en) |
| DE (1) | DE19927601A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2910251A1 (en) * | 1978-03-15 | 1979-09-20 | Minnesota Mining & Mfg | COLOR DEVELOPER FOR COLOR PHOTOGRAPHIC RECORDING MATERIAL, METHOD FOR ITS MANUFACTURING AND ITS USE |
| DE3801536A1 (en) * | 1988-01-20 | 1989-07-27 | Agfa Gevaert Ag | PHOTOGRAPHER COLOR DEVELOPER |
| JPH08248600A (en) * | 1996-03-11 | 1996-09-27 | Konica Corp | Color developing solution for silver halide color photographic sensitive material improved in safety and preservability, etc. |
-
1999
- 1999-06-17 DE DE19927601A patent/DE19927601A1/en not_active Withdrawn
-
2000
- 2000-05-29 EP EP00201918A patent/EP1061416A1/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2910251A1 (en) * | 1978-03-15 | 1979-09-20 | Minnesota Mining & Mfg | COLOR DEVELOPER FOR COLOR PHOTOGRAPHIC RECORDING MATERIAL, METHOD FOR ITS MANUFACTURING AND ITS USE |
| DE3801536A1 (en) * | 1988-01-20 | 1989-07-27 | Agfa Gevaert Ag | PHOTOGRAPHER COLOR DEVELOPER |
| JPH08248600A (en) * | 1996-03-11 | 1996-09-27 | Konica Corp | Color developing solution for silver halide color photographic sensitive material improved in safety and preservability, etc. |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 1997, no. 01 31 January 1997 (1997-01-31) * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19927601A1 (en) | 2001-01-11 |
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