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Old 2nd June 2017, 10:30 PM
kaifis kaifis is offline
Join Date: Oct 2016
Location: Paisley, UK
Posts: 9
Default Diluting C41 final rinse further down?

When I use final rinse for C-41 processing at the stated dilution, I sometimes get the sort of residue marks on 35mm film, which in b/w would make me dilute my wetting agent further down. (I do live in Scotland, where the tab water is very soft. So for b/w, I tend to get away with very little wetting agent in the final rinse before drying.)

In C-41 processing, this happens to me both with Kodak final rinse and, even more so, with the stabilizer which comes with the Digibase developing kits. It's only a problem with 35mm films, medium format dries fine.

Since the main purpose of the C-41 stabilizer is to protect the film from deterioration later on, I'm not so sure if thinning down stabilizer more than as per instruction is such a great idea?

Alternatively, are there C-41 stabilizers around which are less 'soapy' than others?

Any advise would be much appreciated!
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Old 3rd June 2017, 06:39 AM
John King John King is offline
Join Date: Nov 2012
Location: County Durham
Posts: 2,843

I believe C41 stabilisers contain an amount of Formalin which is not in itself soapy but the problem you are having is with the very soft water. Almost anything will make bubbles!

The amount of froth created when you have a shower will show how soft it really is.

You could try diluting the stabilser with bottled water which will in all probability come from an area where the water is not so soft. Diluting the stabiliser further than the recommended will probably just make it less effective.
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Old 12th June 2017, 08:04 AM
JOReynolds JOReynolds is offline
Join Date: Nov 2012
Location: St Albans UK/Agde France
Posts: 983
Default diluting the final bath

Whereas 120 film is coated on both sides, the back of 35mm film is raw triacetate and emphasises drying marks. As I wrote in my post of 30 September 2015, in which I describe the method I was taught as an apprentice (search for 'froth'), I used to process other peoples' film for a living and I never had drying mark problems in soft or hard water. The enemies are impatience and froth (to be avoided at all costs). I did not mention in my post that I fitted a 20-minute delay timer to drying cabinets so that most of the surface liquid had drained off before the warm air came on.
To answer your question, C-41 final bath no longer contains formaldehyde but has additives to extend the life of the dye image. Dilution risks reducing this protection.
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35mm, c-41, processing, residue, stabilizer
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