Muddy Greens

[kb3lms]

I'm using a dichroic head that I believe has glass filters. But a good thought anyway.

More and more I think I am ready to write this one off as a fault of my C-41 processing. When I processed this film about a year ago or maybe even two, I agitated color film like you would agitate a b/w but at a faster rate, ie every 30 seconds or so. It occurred to me when processing some ECN-2 film and reading through all the documents on that process that ECN-2 film is intended for machine processing and agitation would be constant because the film was moving through the solutions in the machine and, assuming those processing machines worked similar to the Kodak X-Ray processors I had dealt with, there would be pumps circulating the solutions and supplying replenisher and so on. Constant agitation of the tank while developing essentially eliminated the green cast I was getting with ECN-2 films.

Then I had the huge mental leap that the same would apply to C-41.

I have been scanning most of my films lately. While VueScan is scanning, it shows you an RGB histogram. Since I have started this constant agitation with color films I have noticed that the RGB components of the histogram have become much tighter.

So, I think that may be the problem. Agitate early and constant.

 

[DREW WILEY]

Dichroic filters do not fade per se, but they can significantly fail over time by slowly spalling off bits of coating or simply by getting dirty. The
heat at which colorheads run has an important relation to both this and their actual transmission characteristics. "Gel" filters fade unequally.
Some colors are way worse than others. And yes, they've been well studied; and all are very inferior to dichroic filters.

 

[mnemosyne]

My first experiments with home developing C41 gave me typical crossover problems described here, even though I used a Jobo CPE2 to maintain
temperature and agitation control. I concluded that C41 home can be done but the process needs a considerable amount of tests and tweaking to get results
reliable and consistent enough for optical printing. I prefer to spend my time with photographing and printing. This is why I leave C41 to a pro lab and are happily printing RA4 at home which I found to be quite simple and straightforward (whether done in a drum on the Jobo or in a small RT machine).

 

[Photo Engineer]

A prewet will help a lot in reducing crossover IMHO.

PE

 

[Sirius Glass]

A prewet will help a lot in reducing crossover IMHO.

PE

That is what I read in a book on Jobo processors and heard from others.