Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,536   Posts: 1,544,227   Online: 783
      
Results 1 to 10 of 10
  1. #1

    Join Date
    Mar 2011
    Location
    Hong Kong
    Shooter
    Large Format
    Posts
    67

    Preping developer (your experience please?)

    This is quite possibility a stupid question... please bear with me.

    Is it possible to mix the developer the night before?
    (My evenings are quite short and would like to do some preparation work the night before. I was wondering if mixing the chemicals and storing them in a dark place. Will that be alright? )

    To prevent oxizdation, can I cover it with suran wrap (I use a clear jug to mix a litre of chemicals; which is enough for one round of negatives)

    Will similar principles apply to fixer and stop bath?

  2. #2
    Ian Grant's Avatar
    Join Date
    Aug 2004
    Location
    West Midlands, UK, and Turkey
    Shooter
    Multi Format
    Posts
    16,270
    Images
    148
    Stop & fix last well in a tray if covered, you could pre-mix those and just make up fresh dev. It's not worth pre-mixing developer you will get some deterioration.

    In reality if you have everything else ready mixing fresh chemistry is so quick and has the advantage you can mix to the right temperature.

    Ian

  3. #3

    Join Date
    Feb 2011
    Shooter
    35mm
    Posts
    17
    The Ilford datasheets say their paper developer can last about a day in an open tray, so you should be ok. Realistically speaking, they are being quite conservative, so you can probably get a bit more than that. I've had good experiences with mixed developer even a week (although it was stored in a bottle, not in an open tray). Personally, I'd suggest keeping all of the chemicals in bottles and just pouring them out when you need them. It shouldn't take that much longer, and is probably better than wrapping the trays (even from a practical standpoint of reducing space and reducing the risk of spillage).

  4. #4
    jp498's Avatar
    Join Date
    Oct 2009
    Location
    Owls Head ME
    Shooter
    Multi Format
    Posts
    1,467
    Images
    74
    If it's for film, I'd suggest a liquid concentrate developer so you can mix it fresh right before use. Something like a liquid PMK/pyrocatHD/hc110/tmax developer will mix up real quick while you presoak the film. This is in contrast to the long time required to mix powdered chemicals like d76/xtol/kodak-fixer.

    Stop or fixer will last a long time in bottles and I'd suggest leaving them in bottles until you are ready to use them, not for oxidation, but just to keep your chemicals organized. You don't want to fix your film before you develop it for example.

  5. #5

    Join Date
    Nov 2009
    Location
    Philadelphia
    Shooter
    Large Format
    Posts
    123
    With powders, you can generally mix them ahead of time. A while ahead of time. It takes several weeks for me to use a gallon of D76 (used once through and mixed 1+1 with water).

    As mentioned, most liquids don't take long to mix at all. On the other hand, do not even attempt to mix pyro based formulas ahead of time. There is a reason the components come in separate bottles.

    What chemistry are we talking about?

  6. #6
    Mike Wilde's Avatar
    Join Date
    Aug 2006
    Location
    Misissauaga Canada
    Shooter
    Multi Format
    Posts
    2,939
    Images
    29
    Quote Originally Posted by degruyl View Post
    With powders, you can generally mix them a while ahead of time. What chemistry are we talking about?
    Yes, I agree. It appears the first poster was talking about diluting a commercially mixed liquid concentrate developer stock solution to the final working dilution ahead of time.

    My mind leapt to an earlier time in my darkroom life diluting Ilford Multigrade paper developer 1:9. Oh, back then my life was simpler. High school, to the present hub and dad of two kids busy with thier own lives.

    I mix most of my developers from raw dry chemical constituents, and I most certainly mix them ahead of time, since a lot need to be very hot to ensure all ingredients dissolve in a reasonable time.

    You are right that some things mix only at time of use, and Pyro based developers are certainly one of them.
    my real name, imagine that.

  7. #7
    Thomas Bertilsson's Avatar
    Join Date
    Jan 2003
    Location
    Minnesota
    Shooter
    Multi Format
    Posts
    14,289
    Images
    301
    One thing about liquid concentrates, whether they have been mixed from powder, or bought in a pre-mixed bottle, is temperature. If you mix the working solution the night before, you have to spend time making sure they are at the right temperature by the time you use them. That takes longer than just mixing the water at the tap to temperature, and adding the liquid concentrate.

    I also use replenished developer, which isn't diluted, so it's warmed up prior to using, so that it's at exactly my desired temperature before I use it. If I use single-shot developer, like HC-110 or Rodinal, I just pour the concentrate into 68 degree water that I get from mixing hot and cold at the tap. And while the film gets its pre-wash, and subsequent developing cycle, I warm up the stop bath and fixer to working temperature, so there I don't really lose any time.

    What would you gain from mixing your working solution the night before? That's the part I don't understand.
    "Often moments come looking for us". - Robert Frank

    "Make good art!" - Neil Gaiman

    "...the heart and mind are the true lens of the camera". - Yousuf Karsh

  8. #8
    36cm2's Avatar
    Join Date
    Aug 2008
    Location
    Northeast U.S.
    Shooter
    Medium Format
    Posts
    575
    "What would you gain from mixing your working solution the night before? That's the part I don't understand."

    I very much understand: time. I've been getting up between 4 and 5 a.m. to print before work. It's the only time I can find and 5 minutes saved can mean a lot. I printed my first acceptable 20x24 print this morning and was very excited. I was less excited when I caught my bus a half hour late and had to skulk into the office looking like a slacker.
    To the OP, I recommend two paths depending on what type of printing you're doing. For proofs and test prints mix up a batch of developer, keep count of how many prints go through it and bottle it up after each session up to a week long, assuming you haven't reached its capacity. For sessions where you're doing final prints, always mix up fresh developer. As for temp, my dr is pretty stable at 70 and I think consistency matters more than actual temp. Hope this helps. Others with more experience are certainly welcome to let me know why this may not be ideal.

    Thanks,
    Leo
    "There is a time and place for all things, the difficulty is to use them only in their proper time and places." -- Robert Henri

  9. #9
    Thomas Bertilsson's Avatar
    Join Date
    Jan 2003
    Location
    Minnesota
    Shooter
    Multi Format
    Posts
    14,289
    Images
    301
    Quote Originally Posted by 36cm2 View Post
    "What would you gain from mixing your working solution the night before? That's the part I don't understand."

    I very much understand: time. I've been getting up between 4 and 5 a.m. to print before work. It's the only time I can find and 5 minutes saved can mean a lot. I printed my first acceptable 20x24 print this morning and was very excited. I was less excited when I caught my bus a half hour late and had to skulk into the office looking like a slacker.
    To the OP, I recommend two paths depending on what type of printing you're doing. For proofs and test prints mix up a batch of developer, keep count of how many prints go through it and bottle it up after each session up to a week long, assuming you haven't reached its capacity. For sessions where you're doing final prints, always mix up fresh developer. As for temp, my dr is pretty stable at 70 and I think consistency matters more than actual temp. Hope this helps. Others with more experience are certainly welcome to let me know why this may not be ideal.

    Thanks,
    Leo
    Leo,

    Thanks for your perspective. I do believe the OP is talking about film developer, though.

    If you mix it the night before (working solution), chances are it will have gone bad, and/or you have to bring it up to temperature. What I suggested was that it takes longer to heat already mixed working solution up to working temperature, than it takes to just mix cold and hot water until you have the right temperature (should take about 12 seconds), and pour in the right amount of concentrate (another 12 seconds), compared to minutes of warming the already mixed developer up (or cooling down if you're in a very hot area). Even if you're lucky enough to have a storage facility for the working solution that is exactly the temperature it needs to be, most single shot film developers will go bad in a relatively short period of time.

    - Thomas
    "Often moments come looking for us". - Robert Frank

    "Make good art!" - Neil Gaiman

    "...the heart and mind are the true lens of the camera". - Yousuf Karsh

  10. #10
    36cm2's Avatar
    Join Date
    Aug 2008
    Location
    Northeast U.S.
    Shooter
    Medium Format
    Posts
    575
    Thomas, yeah I didn't see the negatives reference. My bad. Totally agree with you.
    "There is a time and place for all things, the difficulty is to use them only in their proper time and places." -- Robert Henri



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin