BRITISH JOURNAL OF PHOTOGRAPHY
FORMULAE FOR PROCESSING COLOUR
NEGATIVE MATERIALS

Adox, Agfa, Ferrania, Gevaert and Tellko


Formulae

No. 1 (ADOX, FERRANIA):
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)
Diethyl paraphenylene diamine HCl 3 gm
(or diethyl ppd sulphate 3.2 gm or
p-hydroxyethylamino-aniline sulphate 6gm)
Water, to 1000 cc
No. 2 (TELLKO):
Potassium carbonate 75 gm
Potassium bromide 2.5 gm
Sodium sulphite (anhyd.) 2 gm
p-hydroxyethylethylamino-aniline sulphate 6 gm
Water, to 1000 cc
No. 3 (GEVAERT):
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
No. 4 (AGFACOLOR CN14-CN17):
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
Diethyl paraphenylene diamine (sulphate) 20 gm
Potassium metabisulphite 5 gm
Water, to 100 cc
No. 5 INTERMEDIATE, BATH:
Magnesium sulphate (cryst.) 30 gm
Water, to 1000 cc
No. 6 BLEACH:
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
No. 7 FIXER:
Sodium thiosulphate (cryst.) 200 gm
Sodium sulphite (anhyd.) 10 gm
Water, to 1000 cc
pH: 5.2-6.0

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):
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
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 15 16-21 15 16-18 15 16-22 15 16-18
Bleach 5 17 6 5 18-21 6 5 16-18 6 5 16-22 6 5 16-18 6
Wash 5 12-17 3-5 16-21 5 16-18 3-5 16-22 3-5 16-18
Fix 5 17 7 5 16-21 7 5-8 16-18 7 5 16-22 5 16-18 7
Final wash 20 12-17 20 16-21 15 16-18 15 16-22 7 15 16-18
61 58-60 56-59 55-57 54-56


Gehret, Ernest ---- B.J., 4th March, 1960, page 122