Bubbles in the negatives

[Dani]

Technically you shouldn't reuse the C41 developer with a JOBO due to oxidation, the whole replenisher thing is for roller transport machines or hand inversion. I'm going to wiggle my finger as an old guy and tell you that because you've done it for 10 years, it doesn't mean that you'd get great results. Speaking about your friend. I think I know who your friend is and if you check out his social media accounts, you'll see the effects of reusing chemistry. He uses Fuji Frontier scanners and Pakon, colors shouldn't look like that.

I guess my point is that you can do something incorrectly for a long time and just get away with results that are good for you.

Back to your issue, is it fresh film?
Is the developer too foamy while pouring it out? those bubbles happened during developing.

 

[kyuut]

Technically you shouldn't reuse the C41 developer with a JOBO due to oxidation, the whole replenisher thing is for roller transport machines or hand inversion. I'm going to wiggle my finger as an old guy and tell you that because you've done it for 10 years, it doesn't mean that you'd get great results. Speaking about your friend. I think I know who your friend is and if you check out his social media accounts, you'll see the effects of reusing chemistry. He uses Fuji Frontier scanners and Pakon, colors shouldn't look like that.

I guess my point is that you can do something incorrectly for a long time and just get away with results that are good for you.

Back to your issue, is it fresh film?
Is the developer too foamy while pouring it out? those bubbles happened during developing.

Yes, the friend is a different person that is local to me. he runs replenished ECN-2 on a Jobo and C-41 on Noritsus, he worked with ATLs for C-41 for years with replenishing and his results were always very good. i talked to the FB guy but i haven't seen his work.

i edited the previous message, happens with both fresh and expired film, always worse with expired.
the developer was very foamy yes. it was fine a few runs before.

i've repeatedly thought about one-shot but i haven't found a way to make it viable cost-wise yet. chemistry is really expensive here in brazil

 

[pbromaghin]

I started a thread last year about foaming with replenished D76. The group consensus was that Ilford includes a surfactant in their emulsions and that this will accumulate with developer reuse. After adding a prewash/presoak it has nut reoccurred.

 

[kyuut]

I started a thread last year about foaming with replenished D76. The group consensus was that Ilford includes a surfactant in their emulsions and that this will accumulate with developer reuse. After adding a prewash/presoak it has nut reoccurred.

Interesting, i've also read that commercial c-41 chemistry included surfactants to aid in wetting of the film.
interestingly i only recall foaming happening with ECN-2 twice for me. one extremely expired roll of Fuji cine film (the other rolls developed alongside it were perfect) and more recently a fresh AHU 500t which was developed without a pre-bath due to not containing remjet.
i'm gonna try pre-wetting and monitor what happens. i don't get much c-41 film nor can afford to run 30+ rolls when a roll of c-41 film costs more than $20 in my country, but i'm gonna try to monitor it more closely.

 

[kyuut]

I got in touch with the guy that sold me my ATL-1500 last year. he's running replenished c-41 at 150 rolls/month and his process is exactly like mine, except that he pre-soaks/washes the film to get it to temperature, hes using bellini chemistry (like i do) and Kodak interchangeably depending on what he can get.
i talked to someone else just now, this person is using a hobbyist kit and developing as usual with time extension, they used to pre-soak and not have issues with foam, but now that they don't they are heavy foaming after about 6 rolls.

 

[Dani]

I’ve tried reusing the c41 developer at some point and I ran control strips and plotted them with a densitomer and it was a mess. I trust JOBO and Kodak. I have a Fuji Frontier and I could really see the crossover when I started replenishing. It went back to normal with one shot developer. I know chemistry is expensive but have you thought about mixing the developer from raw ingredients? It’s not that hard and not the chemicals are not that exotic. Bleach is something I wouldn’t mix from raw, but developer I would.

I have a hunch that reusing/expired film is a deadly combo for bubbles.