Thanks for that.
Originally Posted by Photo Engineer
Yeah I did a prewet for a good 5mins before starting. A carry-over from my typical B&W process which has always been worthwhile, I've found. In regards to holding the tank at temp, I didn't actually check the temps coming out (I'll have to do this next time too) as I'm not rotating the tank in a waterbath (my kingdom to find a jobo processor here), but the room wasn't exactly cold when developing so I can't picture a large drop off in temps in the space of just over 3mins. Not one to suggest this level of issue anyway, but then maybe I'm being too relaxed about temperature?
Food for thought for another round of developing tonight with some in-date Portra.
Developer temperature with C-41 is critical to within 1/2 deg F or 1/4 deg C.
The tetenal kit gives 31c times, I used those rather than the 38/39c times, I didnt get any colour casts, certainly nothing like yours even if I drifted off a degree or 2, which would happen time to time.
From my experience the tetenal kit is quite robust, if its not the film, then something has to have gone really wrong on your end other than being off by a little bit.
My suggestion is you've mixed the part A, B, C of the developer up in the wrong ratios, or you've added them out of order (they do funky stuff and gets precipitate when you do that), add them to the required amount of water rather than mixing the concentrates together then to water.
I mixed mine up as I needed it, rather than all at once as well.
This has me thinking. The ratios were right but I did add the chemicals together than added the water at the end. Seemed harmless at the time but I wonder if it could have been enough to make this happen.
Originally Posted by Athiril
After running another test tonight with a rubbish 4x5 sheet of Portra 160NC and getting a similar result, I'm starting to wonder if that could be it. My developing was done completely in a waterbath that didn't budge off exactly 38C for the whole development cycle, and only fell 1C during the blix cycle. Not a temp issue, I'm beginning to believe.
I really don't think it's a temp and or time issue.
I went to answer the door once and couldn't make it back to the "darkroom" on time. The film was in the dev for about 30 sec longer and the temp was probably 3 or 4 degrees off. The images on the roll (Portra 800) ended up being ever so slightly off balance, but was very easily corrected in photoshop and in the enlarger using the filters.
Make sure you mix the chems directly as the instructions say. Last time I checked, the Tetenal kits specifically told you what order to put the mixtures in.
Mix another batch and tell us how it went!
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After tonight's vastly more precise attempt I'm beginning to believe you too. Times were almost second perfect and temps were as bang on as you can get. Also using this sheet of Portra instead of cheap supermarket Superia eliminates the out of date film issue too. Process of elimination points to a chemical issue, to which my mixing the parts before adding the water, as odd as it seems to someone with pretty minimal knowledge of chemicals in general, could very well be the culprit.
Originally Posted by AlexG
I'll be sure to try and build up the courage to run another fresh, properly mixed batch of chems in the next couple of days.
It's definately an issue if you do it like that, unless you thoroughly mix part A with part B before adding C, and even then I wouldn't do it, try a small fresh batch on 35mm mixed up into water, also much easier to tell when fully mixed
Originally Posted by ChrisC
Was there any oily material in the developer?
Mixing order is critical. You are mixing acids, bases and organic compounds. These must be mixed in a specific order or things can go wrong.
I've never ever gotten anything near that bad and I'm pretty sure I processed 8 degrees high once. It's got to be a mixing issue.
Last edited by tiberiustibz; 12-06-2009 at 10:18 AM. Click to view previous post history.
I agree. I've processed C-41 film and RA-4 paper both high and low (3-4 degrees C) and have never had anything like a signficant problem. The images fell well within "usual" color balancing dichro head settings.
Originally Posted by tiberiustibz
Still might be chance of horribly "fried" film.
Ed Sukach, FFP.