Developing colour film as black and white

The wrong process

C-41 colour film has its own chemistry. It needs three specific baths at controlled temperature, a precise process and a lab equipped for colour. Developing it with a black and white developer is, technically, doing it wrong.

And that’s exactly why it’s interesting.

When you develop colour film with Rodinal in stand development — a very dilute solution, no agitation, for one hour — you bypass all the logic the film was designed for. The result is neither a colour image nor a clean black and white. It’s something in between: negatives with a characteristic brown cast, very pronounced grain and a tonal range that the scanner has to push hard to read.

It doesn’t always work. But when it does, it produces something no other process could.

How it’s done

The process we use in the workshop is an adaptation of the original method, tested and documented by Joan since 2016:

Pre-wash — two 5-minute baths with filtered water to remove the anti-halation layer from the colour film, which would otherwise interfere with development.

Stand development — Rodinal R09 One Shot at 1+100 dilution (5ml + 500ml). During the first minute: continuous agitation and three taps on the bottom of the tank to release air bubbles. Then: 60 minutes untouched. Tap water temperature acts as a natural water bath.

Stop bath — Tetanal Indicet 1+9 for 1 minute.

Fix — Ilford fixer 1+5 for 5 minutes.

Final wash — 15 minutes in running water and 1 minute in Tornasol wetting agent.

The result and how to read it

When you pull the film from the tank it looks like nothing has happened. The brown cast is normal — it’s the colour layer of the film that hasn’t been removed by the standard process. It doesn’t mean the development failed.

To scan these negatives you have to push the scanner: automatic settings often can’t find the image. We’ll work manually with curves to extract as much as possible from each frame.

The grain will be heavy. Sometimes very heavy. Depending on the result you’re after, that might be exactly what you want.

Key contents

• C-41 film chemistry: why it works differently from B&W
• Stand development: the logic of unattended development and why it works with Rodinal
• Pre-wash: the colour anti-halation layer and how to handle it
• Full step-by-step process: pre-wash, development, stop, fix, wash
• Reading the resulting negative: the brown cast and how to interpret it
• Forced scanning: how to extract an image from a difficult negative

What’s included

• Rodinal R09 One Shot and all chemicals for the process
• Developing tank, spiral and changing bag
• Use of the scanner for a final check of the negatives
• Refreshments (coffee or tea and fruit)

What to bring

• One exposed C-41 colour film roll (ISO 100–400 recommended, any brand)

Not included

• The C-41 colour film — it must be yours and already exposed. If you don’t have one, you can buy it at Llumàtics or bring your own.
• Full roll scanning (available as an add-on to the Digitalisation workshop or as a one-to-one session from €20)
• Paper prints (not recommended for this type of negative, but possible under controlled conditions)

This process was tested and documented by Joan on his photography blog Pocallum in August 2016. The images in this workshop come from that experimental session.