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Photo Forum / Film Photography / Darkroom / June 2005Life Expectancy of Latent Image on Paper ?
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 > All that talk of film, what about paper? > Given it's slow emulsion speed and usual safer [quoted text clipped - 4 lines] > that expose today - process later method could > see me sooner to some to show printing. Dan 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 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. > ... with paper you can do the exposure anytime you wish, > like right before developing the print. I must be missing > something here. > > Scott 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 > > ... with paper you can do the exposure anytime you wish, > > like right before developing the print. I must be missing [quoted text clipped - 6 lines] > dry side one day, the wet another. More efficient use > of time I'd think. Dan Yeah, I can see a day and maybe even up to a weeek, but the OP was talking about up to a year. Scott >> ... with paper you can do the exposure anytime you wish, >> like right before developing the print. I must be missing [quoted text clipped - 6 lines] > dry side one day, the wet another. More efficient use > of time I'd think. Dan 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  Signature--------------------------------------- "Digital the new ice fishing" --------------------------------------- > dan.c.quinn@att.net wrote:g > > [quoted text clipped - 7 lines] > > Nick 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 > I won't be making any mistakes. Each sheet exposed > and developed will be unique and that allowed for prior to [quoted text clipped - 3 lines] > a dry side - wet side routine is good for > some occasions. Dan 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 Signature--------------------------------------- "Digital the new ice fishing" --------------------------------------- "Scott W" <biph...@hotmail.com>wrote: > 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. 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 The pdf about Agfa paper has a graph showing fading of the latent image. |
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