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  1. #11

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    Quote Originally Posted by M. Lointain View Post
    I have never been a fan of TEA. My experience is that solutions with it don't hold up well over time. I have had solutions oxidate within a short time with TEA. I generally prefer Propylene Glycol if longevity is your goal. Glycol doesn't work with all developing agents, but it does with most. You can easily make a second component with any other base than TEA. Overall I think that is the best strategy.
    I've got a partial bottle of PC-TEA mixed over three year ago, and the stuff still works as good as the day I mixed it. It has gone from a light straw colour to dark brown (just like Rodinal, only thicker), but that seems to be the only change.

  2. #12

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    Quote Originally Posted by Tony-S View Post
    So glycol can be used in place of TEA? I'll keep that in mind for next time.
    They can't be substituted straight across, for pH reasons; I just keep my stock of phenidone in solution in propylene glycol, for easier mixing. I'm pretty sure the amount of glycol introduced into the developer as a result isn't an important difference.

    -NT
    Nathan Tenny
    San Diego, CA, USA

    The lady of the house has to be a pretty swell sort of person to put up with the annoyance of a photographer.
    -The Little Technical Library, _Developing, Printing, And Enlarging_

  3. #13
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    Ok, I'll keep using TEA. Thanks for the tips.

  4. #14

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    Whether your formula calls for TEA or glycol the key is patience. Eventually everything will go into solution. I have found that these developers keep better if they are not heated to too high a temperature. Everything should dissolve even at room temperature, just takes longer.
    A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

    ~Antoine de Saint-Exupery

  5. #15
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    Glycol is merely a preservative - TEA, in 510-Pyro, is both a preservative (in stock solution) and the accelerator when mixed with water to the working dilution. They are not substitutes for one another.
    juan

  6. #16

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    What film, dilution level, time. temp did you use? Looks like you got it nailed.

    Mike

  7. #17
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    Straight from the MDC: 1+100, 7 min, 70 F.

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