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Agfa CN14/CN17 & similar Colour Negative Developers
BRITISH JOURNAL OF PHOTOGRAPHY
FORMULAE FOR PROCESSING COLOUR
NEGATIVE MATERIALS
Adox, Agfa, Ferrania, Gevaert and Tellko
Formulae
| No. 1 (ADOX, FERRANIA): |
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| Potassium carbonate |
75 gm |
| Potassium bromide |
2.5 gm |
| Sodium sulphite (anhyd.) |
2 gm |
| Hydroxylamine hydrochloride |
1.2 gm |
| (or hydroxylamine sulphate 1.4 gm) |
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| Diethyl paraphenylene diamine HCl |
3 gm |
| (or diethyl ppd sulphate 3.2 gm or |
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| p-hydroxyethylamino-aniline sulphate 6gm) |
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| Water, to |
1000 cc |
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| No. 2 (TELLKO): |
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| Potassium carbonate |
75 gm |
| Potassium bromide |
2.5 gm |
| Sodium sulphite (anhyd.) |
2 gm |
| p-hydroxyethylethylamino-aniline sulphate |
6 gm |
| Water, to |
1000 cc |
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No. 3 (GEVAERT):
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| Potassium carbonate |
75 gm |
| Potassium bromide |
0.5 gm |
| Sodium sulphite (anhyd.) |
2 gm |
| Caustic soda (pellets) * |
2 gm |
| p-hydroxyethylethylamino-aniline sulphate |
6 gm |
| Water, to |
1000 cc |
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| No. 4 (AGFACOLOR CN14-CN17): |
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| Sodium carbonate (anhyd.) |
50 gm |
| Potassium bromide |
2.5 gm |
| Sodium sulphite (anhyd.) |
2 gm |
| Hydroxylamine hydrochloride |
1.2 gm |
| Diethyl paraphenylene diamine sulphate |
3.2 gm |
| Water, to |
1000 cc |
If neither distilled nor deionised water is available, but only ordinary tap water, this should be treated by adding to it 2 gm of Calgon (sodium hexametaphosphate) or sodium tripolyphosphate per litre before adding the chemicals, in order to sequestrate the calcium in the water.
It is advantageous to make up a 20 per cent stock solution of diethyl paraphenylene diamine (or p-hydroxyethyl-ethylamino -aniline sulphate) the requisite quantity of which is then added by pipette to the colour developer before use.
| PFD STOCK SOLUTION |
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| Diethyl paraphenylene diamine (sulphate) |
20 gm |
| Potassium metabisulphite |
5 gm |
| Water, to |
100 cc |
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| No. 5 INTERMEDIATE, BATH: |
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| Magnesium sulphate (cryst.) |
30 gm |
| Water, to |
1000 cc |
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| No. 6 BLEACH: |
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| Potassium ferricyanide |
80 gm |
| Potassium bromide |
20 gm |
| Disodium phosphate (anhyd.) |
20 gm |
| Sodium or potassium bisulphate |
12 gm. |
| Water, to |
1000 cc |
| pH: 5.2-6.0 |
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| No. 7 FIXER: |
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| Sodium thiosulphate (cryst.) |
200 gm |
| Sodium sulphite (anhyd.) |
10 gm |
| Water, to |
1000 cc |
| pH: 5.2-6.0 |
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The use of a combined bleach fix is not recommended for colour negative materials.
Notes
Agitation should be for five seconds three times a minute. The magnesium sulphate bath may only be used once.
Ferrania publish a formula for an excellent hardener and bleach which gives perfect results with all colour negative materials.
| VC 212 (FERRANIA): |
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| Potassium ferricyanide |
50 gm |
| Potassium bromide |
25 gm |
| Sodium acetate (cryst.) |
60 gm |
| Boric acid |
5 gm |
| Potash alum |
30 gm |
| Water, to |
1000 cc |
Before drying, the film should be treated for 20-30 seconds in water (if possible distilled) to which has been added 1-2 cc of wetting agent (Aerosol TT, Triton X-100, Sunaptol OP etc.).
Procedure and treatment for the various materials are given in the table below.
| PROCEDURE |
| Summary of steps and timing |
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Adox |
Agfa |
Ferrania |
Gevaert |
Tellko |
| min. |
°C |
formula |
min. |
°C |
formula |
min. |
°C |
formula |
min. |
°C |
formula |
min. |
°C |
formula |
| Development |
6 |
20 |
1 |
7 |
20 |
4 |
8 |
18 |
1 |
12 |
20 |
3 |
8 |
18 |
2 |
| Intermediate bath |
5 |
17 |
5 |
3 |
18-20 |
5 |
3 |
16-18 |
5 |
3 |
16-20 |
5 |
3 |
16-18 |
5 |
| Wash |
15 |
12-17 |
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15 |
16-21 |
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15 |
16-18 |
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15 |
16-22 |
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15 |
16-18 |
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| Bleach |
5 |
17 |
6 |
5 |
18-21 |
6 |
5 |
16-18 |
6 |
5 |
16-22 |
6 |
5 |
16-18 |
6 |
| Wash |
5 |
12-17 |
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3-5 |
16-21 |
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5 |
16-18 |
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3-5 |
16-22 |
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3-5 |
16-18 |
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| Fix |
5 |
17 |
7 |
5 |
16-21 |
7 |
5-8 |
16-18 |
7 |
5 |
16-22 |
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5 |
16-18 |
7 |
| Final wash |
20 |
12-17 |
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20 |
16-21 |
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15 |
16-18 |
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15 |
16-22 |
7 |
15 |
16-18 |
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61 |
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58-60 |
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56-59 |
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55-57 |
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54-56 |
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Gehret, Ernest ---- B.J., 4th March, 1960, page 122
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Apologies for some reason since I cut & pasted the table the line for time/temperature/formula becomes corrupted, this should be OK now
| PROCEDURE |
| Summary of steps and timing |
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Adox |
Agfa |
Ferrania |
Gevaert |
Tellko |
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min. |
°C |
formula |
min. |
°C |
formula |
min. |
°C |
formula |
min. |
°C |
formula |
min. |
°C |
formula |
| Development |
6 |
20 |
1 |
7 |
20 |
4 |
8 |
18 |
1 |
12 |
20 |
3 |
8 |
18 |
2 |
| Intermediate bath |
5 |
17 |
5 |
3 |
18-20 |
5 |
3 |
16-18 |
5 |
3 |
16-20 |
5 |
3 |
16-18 |
5 |
| Wash |
15 |
12-17 |
|
15 |
16-21 |
|
15 |
16-18 |
|
15 |
16-22 |
|
15 |
16-18 |
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| Bleach |
5 |
17 |
6 |
5 |
18-21 |
6 |
5 |
16-18 |
6 |
5 |
16-22 |
6 |
5 |
16-18 |
6 |
| Wash |
5 |
12-17 |
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3-5 |
16-21 |
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5 |
16-18 |
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3-5 |
16-22 |
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3-5 |
16-18 |
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| Fix |
5 |
17 |
7 |
5 |
16-21 |
7 |
5-8 |
16-18 |
7 |
5 |
16-22 |
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5 |
16-18 |
7 |
| Final wash |
20 |
12-17 |
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20 |
16-21 |
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15 |
16-18 |
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15 |
16-22 |
7 |
15 |
16-18 |
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61 |
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58-60 |
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56-59 |
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55-57 |
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54-56 |
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Early Telcolor films were designed to gain a silvermask after processing. This was achieved by propriatory processing done in exclusive laboratories.
Alternatively one could process it the Agfacolor-way as indicated above.
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Early Agfacolor (pre CN14/CN17) was very different as well. I have much older formuale somewhere.
Ian
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