Life Expectancy of Latent Image on Paper ?

Discussion in 'Darkroom Developing and Printing' started by dan.c.quinn, Jun 21, 2005.

  1. dan.c.quinn

    dan.c.quinn Guest

    All that talk of film, what about paper?
    Given it's slow emulsion speed and usual safer
    keeping I'd think exposeing today then processing
    next year would be plenty soon enough.

    With the amount of testing and experimenting I do
    that expose today - process later method could
    see me sooner to some to show printing. Dan
     
    dan.c.quinn, Jun 21, 2005
    #1
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  2. dan.c.quinn

    Scott W Guest

    I can see why someone might not want to develop film right off, but I
    don't see why you would expose paper before you are ready to develop
    it. In the case of film you might be out in the woods or on the road
    but with paper you can do the exposure anytime you wish, like right
    before developing the print. I must be missing something here.

    Scott
     
    Scott W, Jun 21, 2005
    #2
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  3. Actually, I've wondered about this in regards to flashing paper: It is
    much easier to flash a bunch of paper at one time, but I usually end up
    with a few sheets left over. I'd love to know if the fog will degrade
    if left for, say, a week.
     
    michaeleschuler, Jun 22, 2005
    #3
  4. dan.c.quinn

    jo.sto Guest

    The pdf about Agfa paper has a graph showing fading of the latent image.
     
    jo.sto, Jun 22, 2005
    #4
  5. dan.c.quinn

    dan.c.quinn Guest

    Just a matter of shorter sessions in the darkroom. Or
    for the same time spent, more of the one done. Work the
    dry side one day, the wet another. More efficient use
    of time I'd think. Dan
     
    dan.c.quinn, Jun 22, 2005
    #5
  6. dan.c.quinn

    Scott W Guest

    Yeah, I can see a day and maybe even up to a weeek, but the OP was
    talking about up to a year.

    Scott
     
    Scott W, Jun 22, 2005
    #6
  7. This is of particular interest to folks who use paper
    as film, like pinhole photographers.

    I threw a 5x7 pinhole camera together out of scrap
    lumber and have been playing with it, but if I take
    it into the field it will usually be a few hours before
    I can develop my pictures.

    Laura Halliday VE7LDH "Que les nuages soient notre
    Grid: CN89mg pied a terre..."
    ICBM: 49 16.05 N 122 56.92 W - Hospital/Shafte
     
    laura halliday, Jun 22, 2005
    #7
  8. dan.c.quinn

    Nick Zentena Guest


    Only if you're 100% sure of the dry side. First time you make a mistake
    any time saving will go up in smoke.

    Nick
     
    Nick Zentena, Jun 22, 2005
    #8
  9. dan.c.quinn

    dan.c.quinn Guest

    Perhaps I've more of a modular approach in mind
    than some. My background in computer programming has
    underscored that. Then there are the short, in the dark,
    sessions I manage.
    Within a few days I'll be testing that homebrew Lith I've
    mentioned. Each of three or four chemicals will be varied in
    amount. Exposeing and developing times will be altered.
    I won't be making any mistakes. Each sheet exposed
    and developed will be unique and that allowed for prior to
    the start of the series of experiments.
    I've still not an answer to the "Life Expectancy ..."
    question. Perhaps I should test for that myself. Likely
    a dry side - wet side routine is good for
    some occasions. Dan
     
    dan.c.quinn, Jun 23, 2005
    #9
  10. dan.c.quinn

    Nick Zentena Guest


    I make mistakes-) I've seen latent numbers for RA-4 papers but never for
    B&W. Kodak claims 24 hours. I found a Konica document that seems to show 192
    hours with almost no change. I'm assuming Kodak is playing it safe with it's
    24 hour claim. Figure B&W paper would be better. But nobody seems to mention
    it.

    Nick
     
    Nick Zentena, Jun 23, 2005
    #10
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