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  1. #1
    jensenhallstrom's Avatar
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    D-76 waiting time after mixing stock

    Hi, ive seen a thread or two on this subject, some people have explained they havent had any trouble with using their freshly mixed stock d-76 as soln as it cools, others say you have to wait 24 hours after mixing to use. Can i get a legitimate explanation why this 24 hour rule would help the developer in whatever aspect rather than using as soon as it cools? Thanks.

  2. #2
    MattKing's Avatar
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    When it is first mixed, D-76 is more active than normal. If you use it immediately, your negatives will be developed more than normal.

    After 24 hours, the activity will have stabilized, and thereafter will remain quite consistent for some time, until the developer starts to degrade due to age.

    I don't have quantitative information about how much over-development will occur because of using freshly mixed developer.
    Matt

    “Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”

    Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2

  3. #3
    jensenhallstrom's Avatar
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    Quote Originally Posted by MattKing View Post
    When it is first mixed, D-76 is more active than normal. If you use it immediately, your negatives will be developed more than normal.

    After 24 hours, the activity will have stabilized, and thereafter will remain quite consistent for some time, until the developer starts to degrade due to age.

    I don't have quantitative information about how much over-development will occur because of using freshly mixed developer.
    Thank you. That makes sense!

  4. #4
    Bill Burk's Avatar
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    One thing I like to do is maintain personal time-contrast index charts of TMY-2 and D-76.

    The fluctuation in activity of D-76 over time has been explained and I can accept the explanation.

    I would say, that using fresh D-76 while performing calibration lab tests would be a mistake. Just as exposing test wedges immediately before developing would be a mistake. Both of these mistakes would possibly lead you to believe your film speed is higher than you would really achieve in the field.

    But I do not believe using fresh D-76 would be harmful in day-to-day developing.

  5. #5
    Bill Burk's Avatar
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    MattKing's explanation is about perfect.

  6. #6

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    I wait over night before using any developer, not just D76. Reason being when freshly mixed, I always have something floating around and not completely dissolve into water. I'd hate to have them land on my film and create spots of over/under development. I guess I can filter them but I just mix mine the night before so that everything has time to fully dissolve. I don't necessary wait 24 hours. Sometimes, more like 12 hours.
    Develop, stop, fix.... wait.... where's my film?

  7. #7
    clayne's Avatar
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    D-76, I usually wait overnight as it's not going to cool any faster. XTOL I use immediately.
    Stop worrying about grain, resolution, sharpness, and everything else that doesn't have a damn thing to do with substance.

    http://www.flickr.com/kediwah

  8. #8
    markbarendt's Avatar
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    I'd say as soon as the powder has fully dissolved and it has cooled down to the temp you plan to use it at, you are ready.

    I can't see how chemically it would make any difference beyond that.
    Mark Barendt, Ignacio, CO

    "We do not see things the way they are. We see things the way we are." Anaïs Nin

  9. #9
    mfohl's Avatar
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    Quote Originally Posted by MattKing View Post
    When it is first mixed, D-76 is more active than normal. If you use it immediately, your negatives will be developed more than normal.

    After 24 hours, the activity will have stabilized, and thereafter will remain quite consistent for some time, until the developer starts to degrade due to age.

    I don't have quantitative information about how much over-development will occur because of using freshly mixed developer.
    I just mixed a batch a week or so ago. I mixed it in the afternoon, then used it in the evening after it cooled. The negatives seem OK to me; I don't notice anything different from negatives developed after waiting.

    -- Mark

  10. #10

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    Quote Originally Posted by markbarendt View Post
    I'd say as soon as the powder has fully dissolved and it has cooled down to the temp you plan to use it at, you are ready.

    I can't see how chemically it would make any difference beyond that.
    Will it stil mix OK with tap temp water? Or does the water have to be heated?

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