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  1. #1
    Ian Grant's Avatar
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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):
    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

  2. #2
    Ian Grant's Avatar
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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
    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

  3. #3
    AgX
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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.

  4. #4
    Ian Grant's Avatar
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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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