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  1. #1
    perminna's Avatar
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    Impressed on Tetenal C-41 chems mixed 3.5 months ago

    I developed my 11th C-41 roll in the same Tetenal Colortec C-41 (1 liter) chemicals. The chemicals were mixed back in March 2010 -- over 3 months ago. The colors turned out still fresh and bright. Tetenal recommends that the mixed chems are used for max. 6 weeks and then replaced. I've used same liquids for over twice as long.

    How long have you been able to use same mixed Tetenal C-41 chemicals? How many films you've been able to develop with same liquids?

    I could almost swear the colors have become better after every film.

    Slight over-exposure is because of the exposure meter on my Mamiya M645. Kodak Portra 160VC in 120 format.

    // Nikon F100 / Nikon EM / Rollei XF 35 / Minolta Hi-matic 7s / Mamiya M645 1000s / Yashicaflex / Welta Weltax //

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  2. #2
    Ian Grant's Avatar
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    I've always used up all my C41 chemistry way before the recommended time, but Tetenal chemistry is excellent. I use their RA-4 in my Nova tank when doing colour prints and that lasts well to.

    Ian

  3. #3

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    I have used the C41 Tetenal kit as well when I started doing C41. I haven't done any C41 for a while but I am pretty certain that I got longer out of the chems than the Tetenal instructions indicated. Manufacturers have to be very conservative about the life of their chems to avoid, I suspect, claims from users if the chems were to die 1 day before the specified time limit :

    It may also be that manufacturers have to try and take the worse case scenario into account in terms of customers who are a "bit cavalier" about chemical husbandry.

    We live in a litigious, compensation claiming culture and here's an example where it bites back when maybe manufacturers cannot risk giving us "good news" in case there is the odd occasion when someone wants to shout "liar" in a court setting.


    pentaxuser

  4. #4
    Rudeofus's Avatar
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    While I never dared to overstretch the expiration time by that much, I do use Tetenal E6 working solution for one or two rolls more than specified and also sometimes for three weeks instead of the recommended two - with no visible differences in the end result compared to fresh solution. I do understand the tight limits stated in the manual, though. Just imagine someone ruins really important shots (think: wedding shots, newborn shots, ...) with developer that is used within stated limits but still doesn't work: APUG would be full of "Tetenal ruined my perfect $IMPORTANT shots" threads ...

  5. #5
    2F/2F's Avatar
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    I don't know what happened with your chems, but having experienced the results of C-41 developer death (and it AIN'T PRETTY), I will never try to use the chemicals over six weeks after mixing ever again.
    2F/2F

    "Truth and love are my law and worship. Form and conscience are my manifestation and guide. Nature and peace are my shelter and companions. Order is my attitude. Beauty and perfection are my attack."

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  6. #6
    perminna's Avatar
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    I'll be scanning another film I developed with the same chemicals (film #12) this weekend. I will post a sample shot of it too. It'll be interesting to see the film scanned because I accidentally shot a ISO100 film at ISO160-200 so I had to push it (30s more dev time).

    I recently bough a Paterson tank* which enables me to develop a 120 film with 500ml of chemicals so in the future I'll be mixing only 500ml at a time. Which will of course mean I'll be using the chemicals for shorter time period.

    *) I also had an AP tank which requires 590ml for 120 film which has forced me to mix 1000ml of chemicals at a time.
    Last edited by perminna; 07-02-2010 at 08:01 AM. Click to view previous post history.
    // Nikon F100 / Nikon EM / Rollei XF 35 / Minolta Hi-matic 7s / Mamiya M645 1000s / Yashicaflex / Welta Weltax //

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  7. #7

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    Tetenal, etc.

    I had been using the Tetenal C-41 kit, which seemed to work fine. eventually the developer died, though it was mostly all used up by then. I recently switched to all Kodak chems for C41, with separate bleach and fix. At first glance the negs seem better - just slightly clearer and better, it seems. Hard to say for sure without denisitometry but it just seems like they are better than the Tetenal Blix C41 chems. As a bonus the kodak chems are cheaper per roll I think. (the hazmat shipping is a killer though! Almost doubles the price on some parts of the chemistry.)

    I use a Phototherm SuperSidekick 4 which uses 2 oz. (60ml) of solution per run, plus 3 ½ oz. (105 ml) per roll. It can do 4 rolls at a whack so 4 rolls of either 35 or 120 uses only 480ml of chems. I use them all one-shot except I save the bleach to regenerate it for reuse later.

    I mixed partial amounts of the developer, and tried to tightly seal the concentrates using inert gas, we'll see how they keep. Hopefully well.

    -Ed

  8. #8
    Rudeofus's Avatar
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    Quote Originally Posted by perminna View Post
    *) I also had an AP tank which requires 590ml for 120 film which has forced me to mix 1000ml of chemicals at a time.
    Wouldn't it be easier to get the 5l kit and mix quantities of 625ml each time? As long as you seal the concentrate it should last for a while, plus the 5l kit is substantially cheaper per roll than the 1l kit. I do this with the E6 kit at the moment and it seems to work well.

  9. #9
    perminna's Avatar
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    Quote Originally Posted by Rudeofus View Post
    Wouldn't it be easier to get the 5l kit and mix quantities of 625ml each time? As long as you seal the concentrate it should last for a while, plus the 5l kit is substantially cheaper per roll than the 1l kit. I do this with the E6 kit at the moment and it seems to work well.
    This would be another solution. I'm going to buy 5l kits next, I'm just learning and trying out color dev. The 1l kit I'm using right now, is my first C-41 kit ever! I still have another 1l kit of C-41 and also one E-6 to be used. Then I'll be buying either 5l kit of Tetenal, Fuji or Kodak.

    ---

    Another news: I developed a Fuji Reala 100 (in medium format) with the same Tetenal liquids. The roll had to be pushed to ISO160-200 because I accidentally started shooting the roll with wrong ISO set on my Mamiya's meter. The roll was #12 with the same liquids. The dev time was 4:15 (3:45 + additional 30s for pushing) just like instructed in Tetenal manual.

    The results are pretty good: the frames I shot at ISO 160 are a bit over exposed, the frames I shot at ISO 200 are better. I'm still daring myself to dev at least one another film with the same liquids although it's obvious that the colors are starting to look a bit washed out. That said, I never have had a proper saturated results with Fuji Reala 100 and Tetenal combo even when the chemicals were fresh.

    Metered at ISO160:
    // Nikon F100 / Nikon EM / Rollei XF 35 / Minolta Hi-matic 7s / Mamiya M645 1000s / Yashicaflex / Welta Weltax //

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  10. #10

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    iso 160

    If I develop iso 100 at 30 celsius degrees - 8 mins, blix 6 mins -- what would be the developing/blixing time for 160 iso?

    thx, p.


    Quote Originally Posted by perminna View Post
    I developed my 11th C-41 roll in the same Tetenal Colortec C-41 (1 liter) chemicals. The chemicals were mixed back in March 2010 -- over 3 months ago. The colors turned out still fresh and bright. Tetenal recommends that the mixed chems are used for max. 6 weeks and then replaced. I've used same liquids for over twice as long.

    How long have you been able to use same mixed Tetenal C-41 chemicals? How many films you've been able to develop with same liquids?

    I could almost swear the colors have become better after every film.

    Slight over-exposure is because of the exposure meter on my Mamiya M645. Kodak Portra 160VC in 120 format.


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