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Photo Forum / Film Photography / Darkroom / May 2005C-41 split developer
Would anyone share the formula and process for the C-41 split developer? The one that was initially published in Darkroom Techniques (Photo Techniques) magazine years back. The process was relatively temperature independent. Any help would be appreciated. Thanks If you know about what year that was, I can check. I have almost all the issues. Francis A. Miniter > Would anyone share the formula and process for the C-41 split developer? > The one that was initially published in Darkroom Techniques (Photo > Techniques) magazine years back. The process was relatively temperature > independent. Any help would be appreciated. > Thanks Frank and others, I have this scribbled down at home and will try to remember to fish it out when I get home tonight. From what I remember it was from Patrick Dignan and appears in an issue from around 1994 (very close to when they did the name change, it was tricky to find at the library for that reason). I have not tried the formula, though. Jordan > Would anyone share the formula and process for the C-41 split developer? > The one that was initially published in Darkroom Techniques (Photo > Techniques) magazine years back. The process was relatively temperature independent. Any help would be appreciated. > Thanks >Frank and others, > [quoted text clipped - 13 lines] > independent. Any help would be appreciated. >> Thanks Dignan held a contest for divided color formulae, then patented some variation of what is prior art. Just double the developing agent in the A bath and the alkali in the B bath. I used my version, formulated long before Dignan's ripoff for everything; Kodak, Fuji, Agfa, Ferrania, and movie short ends. The thing does just what you'd expect. Robert Vervoordt, MFA I found it. Darkroom & Creative Techniques, Nov-Dec. 1995, p.40, Patrick Dignan, "A Divided Color Developing Solution that Really Works". He gives the Dignan NCF-41 Formula as follows: A Bath Water (distilled): 300 ml Sodium Bisulfite : 0.5 g. CD-4 : 5.5 g. Sodium Sulfite : 4.5 g. Water (distilled) to make 500 ml. pH @ 75° : up to 6.5 B Bath Water (distilled) 500: ml Potassium Carbonate : 53 g. Potassium Bromide : 0.5 g. Benzotriazole (Kodak Anti-Fog #2) : 2 mg. (not used in tests described in text) Water (distilled) to make : 1 liter pH @ 75° : 11.8 Developing temperature : 75° 3:00 min in A Bath with continuous or intermittent agitation 5:45 min in B Bath with agitation of your choice Stop Bath Blix (note at 75°, it will take longer to do its job than at 100°) Francis A. Miniter > Frank and others, > [quoted text clipped - 15 lines] > >> Thanks I tried it on Kodak TCN400 film, a C41 process B/W film(120 format) Since I did not have potassium carbonate, I used sodium carbonate. I got very thin negatives. The image was visible, but very faint one. Perhaps potassium carbonate is essential for the working, I am not sure. Also, the bottle in which I stored bath-A developed a huge amount of sludge over time. -Sreenath > I found it. Darkroom & Creative Techniques, Nov-Dec. 1995, p.40, Patrick > Dignan, "A Divided Color Developing Solution that Really Works". [quoted text clipped - 49 lines] > > > >> Thanks >I tried it on Kodak TCN400 film, a C41 process B/W film(120 format) > [quoted text clipped - 3 lines] >Perhaps potassium carbonate is essential for the working, I am not >sure. I have found that the Potassium salt is more active in this sort of formulation. It turned out to be so in my Cibachrome formulations. >Also, the bottle in which I stored bath-A developed a huge amount of >sludge over time. Juist a small amount for me over a very long period of use. Could be water problems. Just filter it out if it still works. >-Sreenath > [quoted text clipped - 58 lines] >> > >> >> Thanks Robert Vervoordt, MFA |
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