This is killing me. Why do i keep getting these streaks on my film?

[NB23]

It is definitely recomended in the various C-41 developing kit instructions...

Hmm, then they certainly hid the documents that advise pre-soak for C-41 (or E-6) very well.

Publicly accessible ones specifically advise (in bold font) AGAINST pre-soak:

Do not immerse the film in a warm water pre-soak. Warm-up step is done by warming the outside of the tube with hot air or in a tempered water bath.

Can you point me to the Kodak resource that supports the C-41 pre-soak claim? Thanks!

 

[foc]

It is definitely recomended in the various C-41 developing kit instructions...

I think there may be some confusion regarding the C41 pre-soak. Commercial kit versus home kit

In the following, I can't find any instruction for pre-soak as it is not standard procedure in commercial C41.

https://125px.com/docs/techpubs/kodak/z131_01.pdf
https://asset.fujifilm.com/www/es/f...c1415ebb38e6902f7d5291f8/TB_C41_E01_10-20.pdf

Home kits may suggest a pre-soak, usually to get the developing tank temperature correct.

 

[brbo]

It is definitely recomended in the various C-41 developing kit instructions...

That's hardly "pre-soak is mandatory for colour film". No one relevant in C-41 processing business ever said pre-soak is mandatory, AFAIK. Every source points to the fact that the process was designed not to include pre-soak.

Yes, some of us might think that pre-soak might help somewhat, but that's more because we run non-controlled process on subpar equipment and not because we all missed the pre-soak step in official C-41/CN-16/E-6 process manuals.

 

[NB23]

What exactly are we talking about here? C-41 Commercial or HOME development?

I am a presoaking opponent for BW films, for all the obvious reasons.
However (!) C-41 home development is not a practice that is even remotely precise. Norhing is precise about home-developing C-41. Nothing. It’s all an approximation: from the unrobotic inversions, the pouring of chemicals, the questionable real temperature... it is all one big approximation in the end. And this is why, a presoak has been recomended for c41 development at home, in the various brochures. Be it for tempering, for a smoother pouring, for magical thinking or for scientific reasons: a presoak for c41 home development is and has always been recomended. According to me, the reason for this is to alleviate all the very inexact actions that home-developing induces to the process. No, home-development can never be compared to the HIGH standard of commercial processing.

 

[NB23]

That's hardly "pre-soak is mandatory for colour film". No one relevant in C-41 processing business ever said pre-soak is mandatory, AFAIK. Every source points to the fact that the process was designed not to include pre-soak.

Yes, some of us might think that pre-soak might help somewhat, but that's more because we run non-controlled process on subpar equipment and not because we all missed the pre-soak step in official C-41/CN-16/E-6 process manuals.

Get a grip, man. What you are saying is exactly what I was saying, and what c-41 home development kits are saying: presoak is recomended for home devrlopment. And here, we are indeed discussing home development, and more precisely about why a guy has had streakings with his home development regimen, not about industry standardized ISO9001 robotic chain production and development of film to 99.9991% repeatability.

 

[koraks]

why a guy has had streakings

Which might not have had anything to do with presoak anyway. I never do a presoak with c41, shoot me.

Btw no reason to get so worked up about this. Relax. It's not religion or anything.

 

[sillo]

FWIW Kodak specifically mentions NOT to presoak in z131. In my own developing with a jobo I had much better results skipping the presoak too.

 

[mshchem]

This is how wars start.

 

[foc]

This is how wars start.

Big end of the egg or small end?
(if you don't understand this reference then check out Gulliver's Travels)

 

[removed account4]

I am a presoaking opponent for BW films, for all the obvious reasons.

which goes against what emulsion scientists like Ron Mowrey has stated.

==\

OP.
I hope you were able to do a pre soak control to rule that out,
I also hope you do a pour faster to rule that out
I hope you do a add more fluid to your tank to rule that out
I hope you were able to try another processing method and rule that out...

and regarding the chicken and egg
it was the ostrich ..

 

[mshchem]

Big end of the egg or small end?
(if you don't understand this reference then check out Gulliver's Travels)

Tangential, but check out ovorotation regarding chicken eggs. The egg is formed and travels through the hen pointy side down, then the egg rotates so the blunt end is the end that emerges first. Kinda reminds me of an Apollo command module.

 

[mohmad khatab]

This is how wars start.

You beat me to it and said what I wanted to say.

 

[foc]

Tangential, but check out ovorotation regarding chicken eggs. The egg is formed and travels through the hen pointy side down, then the egg rotates so the blunt end is the end that emerges first. Kinda reminds me of an Apollo command module.

The reference was to

This is how wars start.

and my reply refers to Gullivers Travels in Lilliput and the reason for going to war was which end of the egg should be opened. (it was supposed to be a joke)
I'm afraid the hen and how she produces the egg, had nothing to do with the story !

 

[Tom Kershaw]

I use a pre-soak for C-41 films. Not entirely sure why as I don't use one for B&W or E6 but I get good colour negatives so will continue to do so until there is a problem. Ron Mowrey always seemed keen on pre-soaking.

 

[Aditya Tawate]

Hello all, sorry to barge into this thread like this. I've researching and posting about an issue i have been facing with my C41 developing and came across this discussion. The images which @reelquickfilmlab posted are certainly relevant to my scans and negatives.

I use Jobo CPE2 with a 2520 tank for developing C41 films with Kodak Flexicolor kit. I don't perform a stop bath in between Developer and Bleach, but have been facing random streaks across the frames, especially in the highlights. I've been suspecting bad film emulsion, bad chemsitry, contaminated chemsitry, unclean tank or spools but couldn't conclude anything. Also, such issues and their solutions seemed to very rare on the internet forums. Until i jumped on this discussion. I'll post the images here and maybe you guys can share some insights regarding the same.

I think I've been too casual about pouring in developer and other baths in the tank and then mounting it on the jobo. Maybe that's the root cause of my issue as well. Please help!

 

[Aditya Tawate]

Attaching the images here.

 

[Sirius Glass]

Hello all, sorry to barge into this thread like this. I've researching and posting about an issue i have been facing with my C41 developing and came across this discussion. The images which @reelquickfilmlab posted are certainly relevant to my scans and negatives.

I use Jobo CPE2 with a 2520 tank for developing C41 films with Kodak Flexicolor kit. I don't perform a stop bath in between Developer and Bleach, but have been facing random streaks across the frames, especially in the highlights. I've been suspecting bad film emulsion, bad chemsitry, contaminated chemsitry, unclean tank or spools but couldn't conclude anything. Also, such issues and their solutions seemed to very rare on the internet forums. Until i jumped on this discussion. I'll post the images here and maybe you guys can share some insights regarding the same.

I think I've been too casual about pouring in developer and other baths in the tank and then mounting it on the jobo. Maybe that's the root cause of my issue as well. Please help!

Do you have one of these? It helps make pouring more consistent.

https://www.catlabs.info/product/new-style-lift

 

[Aditya Tawate]

Do you have one of these? It helps make pouring more consistent.

https://www.catlabs.info/product/new-style-lift

No, i have the standard CPE2 Plus without the lift which makes pouring part easier

 

[TunkuFawzy]

After developing some more 120 film the streaking is gone and I think it's most likely due to the faster pouring times. Thank you @koraks I did however try pre-soaking the film and am not sure if that played a part as well. But thank you all for the help. I now need to figure out what ratio to mix the stabilizer since the one Cinestill recommends is yielding spots on the negative.

Hi, Can I follow up with you? Are you still using Cs41 from CineStill? Many thanks!