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  1. #11

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    Quote Originally Posted by newcan1 View Post
    I do mix concentrates for C-41 but leave the CD4 dry. Concentrate 1 is everything but HAS; Concentrate 2 is HAS. When I mix them together and with water, I finally mix the CD4 with a little water on its own until dissolved, and then add to the mix. I find this works very well and is very convenient. The stocks seem to last very well, and the dry CD4 of course lasts a long time.
    Why is HAS kept in a separate concentrate? Does it harm something else, or does something else (perhaps carbonate?) harm the HAS?

    Mark Overton

  2. #12

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    I have no idea. I originally started with an old Zone V recipe and that's how they mixed the concentrates, and when I went with a slightly different formula, I just did the same. I'm not a chemist and feel greatly inferior to the intellect of those here who are.

  3. #13
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    Guys;

    Wikipedia is your friend. Read here:

    http://en.wikipedia.org/wiki/Hydroxylamine

    DUH! and KABOOM.

    PE

  4. #14

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    Shows how much of the world I fail to understand. PE, I read the Wikipedia article, and didn't understand a word of it, except I could see how KABOOM might be relevant!

  5. #15
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    Don't worry about it. The kit, when packed properly is ok.

    PE

  6. #16

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    What function DTPA Na5 has in this developer? Is it necessary, to use it?

  7. #17
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    Quote Originally Posted by Photo Engineer View Post
    DUH! and KABOOM.
    This is actually one of my favourite past-times/hobbies.

  8. #18
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    DTPA is a sequestering agent as shown here: http://en.wikipedia.org/wiki/Pentetic_acid

    PE

  9. #19

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    Quote Originally Posted by albada View Post
    For that matter, does anyone have information on the C-42 process? My internet search turned up nothing.
    Kodak's C-42 process was intended for large finishers where the conventional C-41 product lines perhaps did not make sense. For various reasons, Kodak was willing to license such finishers to bulk mix their own chemicals; the C-42 process was the version used. This was confidential information, and apparently the licensees did a good job keeping it so.

    Mixing according to the "developer" formula was sort of irrelevant to C-42 licensees; no high-volume user would mix to this formula (aside from initial processor tank fills). Rather, they would mix to the "replenisher" formulation, and the seasoned processor tanks would tend toward the specs for "developer," generally called the "tank solution" by people in the business.
    Last edited by Mr Bill; 06-08-2012 at 06:45 PM. Click to view previous post history.

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