Tetenal E6 lifespan

[sagai]

Hi World!
Do we know the lifespan of this chemical after having mixed to working solution?
Maybe an already answered question, apology for recasting than.
Thanks!

 

[Rudeofus]

The is a life span given in the instruction booklet for all process liquids, as unopened concentrate, as opened concentrate and as working solution. These liquids don't fall off a cliff when they expire, but results will become gradually worse over time, therefore you can't really specify a lifespan for these chemicals.

 

[sagai]

I know their c41 last more or less forever regardless booklet says.
That's I am looking for any experience gained already.
2 weeks for 50% used working solution makes me rather concerned.

 

[Rudeofus]

These working solutions last for much longer than indicated if you are willing to accept wrong contrast, colour cross over, fog (oxidized PPD goes up in pH), reduced Dmax, speed loss. None of these issues are of major concern if you go the hybrid route, that's why people can use C-41 for months. While few here do optical RA-4 enlargements, slide projection is still something people look into, therefore you may want to apply more stringent process control with E6.

 

[PittP]

+1.
The usable life span as indicated by Tetenal should absolutely be respected. For used solutions, I find Tetenal's proposal rather optimistic. Once the original bottles are opened, check for crystals in 1st developer and sulfur (light yellow precipitate) in blix part 2. Once these start showing up (in my case, 2x within 1 year of purchase), results will become unpredictable and picture quality (colour, contrast) deteriorates rapidly.

 

[sagai]

Thanks!
So than probably for E6 I need to wait to have 10ish canisters and than develop it in raw ...
Regardless my interest for a slide projector, to be honest it is a deal breaker for me with E6.
Thank you!

 

[Rudeofus]

There is no need to process 10 rolls in one batch. Depending on film format and whether you do roller or inversion processing, there is no need to mix the whole batch at once. As long as you protect FD, CD and BX2 with inert gas, opened concentrate bottles will last for about a year.

 

[sagai]

Well, Tetenal batch I am looking at is for 1 liter working solution.
If it last a month only, I must process its capacity that is roughly 10 canister in that timeframe.
... Or may be I have misunderstood something ...

 

[Rudeofus]

Well, Tetenal batch I am looking at is for 1 liter working solution.

There is no need to mix the whole batch at once, and it is trivial to scale the mixing instructions for 125, 250 and 500 ml working solutions. A film tank for 120 format film needs 500ml for inversion processing, and less than that for rotation processing. If 35mm film is your thing, you get away with 250ml batches for inversion processing, and even less for rotation processing. Get Tetenal Protectan spray to make the remaining concentrates last in their respective bottles and be done with it.

 

[sagai]

Vvow!
Okay! Getting there!
Thanks!