Adventures in Home C-41

In previous episodes I had written that for Fall colour this year I was going to use colour negative film and develop it myself with a home C-41 kit, so this is a bit of a progress about how that went, or at least how it is going thus far. 

The C-41 process itself is really nothing new to me. Back in the old camera store days a significant part of my job involved operating the onsite Kodak/Noritsu mini-lab including replacing exhausted chemistry and other process maintenance tasks. Doing it at home then should involve no more than combining that knowledge with the black and white processing skills that are routine for me and - spoiler alert - for the most part they were.

In contrast to the C-41 chemistry I knew from the past which always came in liquid form, the Tetinal/Jobo C-41 press kit I ordered was composed entirely of packets of powdered chemicals. Aside from that however the sequence chemical baths was the old familiar one, though what we had always called "bleach fix" goes by the cooler sounding name "blix" in these kits. The it's the same thing though, and once mixed it even had that same odour, the one that always gave the old lab its characteristic aroma. It's not particularly strong or unpleasant mind you, certainly less so than the vinegar smell of stop bath used in black and white processes. For me in fact the scent was pure nostalgia.

Unlike the cool room temperature 20^oC (68^oF) that is the most common standard temperature for processing black and white film, the instructions that came with my C-41 kit were all geared for a temperature of   39^oC (102^oF). This means the chemistry must be warmed up significantly before starting, and kept there throughout the process. I found getting a temperature change of just a few degrees for black and white had sometimes been a real pain, so I thought bringing it up by nearly 20 degrees would take ages. In the Flickr forums I received several assurances from others who had done this before that a simple water bath would get the job done in just a few minutes and indeed it seems I had underestimated the efficiency of this method. On my first go at developing a film I put the C-41 developer and "blix" into the sink and filled it with the water running purely from the hot tap to just below the mouth of the storage bottles then headed into the darkroom to load the tank. Figuring it would take quite a while for the chemistry to come up to temperature I really lollygagged through this process and as a result when I finally checked the temperature of the chemistry it turned out I had to wait for it to cool a bit. Lesson learned.

Having brought the chemicals up to temperature (the final stabilizer bath can be left at room temp) I emptied the sink, got the tap running at exactly 39^oC then refilled the sink to act as a temperature stabilizing bath and filled the daylight tank now loaded with film.  One difference between the old automated C-41 machine process and the home kit is that in addition to the usual chemical baths a pre-soak is recommended and a water rinse is used in between the blix and stabilizer.

Unlike black and white film processing and the often wildly varying processing times you can get depending on the particular combination of film and developer you chose, colour processes like C-41 are standardized affairs. As a result I felt compelled to abandon the gentle and rather idiosyncratic agitation method I usually use for the comparatively brutal inversion cycles assumed in the processing instructions.

Shot on Kodak Portra 160, developed in the kitchen sink.

The first film processed was a roll of Portra 160 I ran through the RB67 and it looks pretty good. As is my usual practice I squeegeed the film prior to hanging. I've never been happy about having to do this as it sometimes leaves fine scratches that can be visible when scanned or printed, but this is better than dealing with the water spots that seem to be the inevitable result of failing to do this, even if the final rinse is done in distilled water. Other photographers have sworn this is not necessary and no doubt it isn't given their particular combination of water supply, humidity levels, working habits and whatnot. The C-41 process ends with the film being hung straight out of the stabilizer solution with no other rinse in between. I wondered if this might be different enough to allow me to forego the squeegee, so with the second roll I processed I decided to just give the film a shake before hanging to dry.

Apparently little more care is needed with the drying process.

Well, it was a noble experiment. The above result says it all. This is from the second test roll I put through the Minolta Hi-Matic 9. It was taken in the pouring rain and the scan is straight from the Epson V500 on default settings. There were two or three frames on the roll that weren't ruined, but this one is typical. Admittedly I used tap water to mix the stabilizer, but this may be the worst case of water spots as I've ever had and if distilled water didn't cure my problems there I can't see it being much use here. It looks like squeegee it will be.

If years gone by are any indication it won't be long before the urge to shoot colour once again drops off the radar screen. The oft spoken of peak of colour has already gone by for another year, though it's not always about getting those super punchy reds oranges and yellows. That in between period as the colours are on their way to a faded brown can have a mood all its own as well and if I'm lucky I may be able to capture some of that before it's gone.