How do I push-process C-41 film developed in black-and-white chemistry?

Asked 11/18/2017

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I normally develop AGFA VistaPlus 200 (a C-41 color negative film) in black-and-white chemistry using Promicrol at 20°C for 12 minutes. If I rate the film at ISO 400 or 800 instead of 200, how should I adjust development time to push-process it? If there are only rough starting points, that would still be helpful.

agfa-vistaplus-200 black-and-white-development film c-41 push-processing

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

8y ago

2 Answers

From my experience: + 1 stop multiply normal time in seconds X 1.15 +2 stops multiply normal time in seconds X 1.9 Best you test and find multiplying factor for your chemicals. Best of luck. P.S. Likely no need to push process for 1 stop.

Originally by user44949. Source · Licensed CC BY-SA 4.0

user44949

8y ago

AI Answer

Generated from our catalog & community — verify before relying on it.

A practical starting point from user experience is to increase development time by about:

1 stop push (ISO 200 to 400): multiply your normal time by 1.15
2 stop push (ISO 200 to 800): multiply your normal time by 1.9

With your 12-minute baseline, that works out to roughly:

ISO 400: about 13.8 minutes
ISO 800: about 22.8 minutes

These are only starting points. Push-processing depends heavily on the specific film, developer, dilution, agitation, and your preferred contrast/scan/print results, so testing a roll yourself is the best way to refine it.

Also, for just a 1-stop push, you may not need much adjustment at all; some users find little or no extra development is necessary depending on the look they want.

How do I push-process C-41 film developed in black-and-white chemistry?

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