Paper Latent Image longevity

Discussion in 'B&W: Film, Paper, Chemistry' started by Tom Stanworth, Oct 7, 2003.

  1. Tom Stanworth

    Tom Stanworth Member

    Messages:
    2,027
    Joined:
    Sep 4, 2003
    Shooter:
    Multi Format
    I want to start printing images in batches, exposing say 10+ and then processing the paper afterwards. Because I have another Job, I do not always have the time to process straight after exposing.

    How long do I have before the latent image degrades? Are there significant differences between papers (I use Oriental VC, Polywarmtone and Agfa MCC)?

    Any help could mean less complaints from my wife as my print washer may not always end up in the bath after every session!

    Cheers

    Tom
     
  2. Les McLean

    Les McLean Subscriber

    Messages:
    1,609
    Joined:
    Oct 18, 2002
    Location:
    Northern Eng
    Shooter:
    Multi Format
    Tom,

    I used to print up to 1000 swatch prints at a time from 1 negative for a UK company and process them in small batches when they needed them and noticed no change in the image from the first to the last print made. I always retained a print from the first set printed for comparison. Sometimes I processed the final set of prints several months after exposure.
     
  3. Lex Jenkins

    Lex Jenkins Member

    Messages:
    229
    Joined:
    Aug 27, 2003
    Location:
    Fort Worth,
    This subject once came up on the CompuServe photo forum where Ctein is a longtime member. He offered an observation that I hope I'm retelling correctly.

    If I'm getting this straight, his testing showed that an exposure time of at least 10 seconds was needed for a stable latent image. Anything less would make for an unstable latent image.

    Hence, preflashing paper could not be done in batches and held for days or weeks, possibly not even for hours or minutes.

    Again, blame me for errors or omissions in this retelling. That discussion occurred several years ago and, unfortunately, CompuServe threads are not archived indefinitely so there's no way to go back and verify my recollection.
     
  4. john_s

    john_s Subscriber

    Messages:
    1,110
    Joined:
    Nov 19, 2002
    Location:
    Melbourne, A
    Shooter:
    Medium Format
    The Agfa pdf for the current Brovira papers have a graph of the slow deterioration of latent image. The small decline seems impressive. But, as pointed out above, I can see how flashing and unusually short exposures could fade more quickly. The only real answer is that four letter word. (test)
     
  5. Black Dog

    Black Dog Member

    Messages:
    3,238
    Joined:
    Jul 21, 2003
    Location:
    Eight miles high
    Shooter:
    Multi Format
    I've always exposed prints in batches and stashed them in empty packets for up tp several hours and not noticed any problems. As has been pointed out though, you have to process preflashed paper pretty much there and then otherwise the effect wears off.