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  1. #1

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    Oct 2007
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    Does exposed film deteriorate faster than unexposed film?

    So, I found two rolls of Elitechrome in a random box of my photo stuff the other day. Both have been sitting around at room temperature (~75 degrees) for a year or two and are a few years expired. One was exposed and the other was not.

    For kicks, I shot the unexposed roll and sent them both out for processing. When I got them back, the roll sat exposed for a year was heavily magenta fogged while the other roll was (more or less) perfect.

    It is conceivable (but unlikely) that these rolls were stored under different conditions before I received them -- a friend gave them to me around when they expired. Since I've received them, they been together, both stored in their canisters.

    Is this a real thing or is it a fluke? If so, what causes it?

    Jason

  2. #2
    Athiril's Avatar
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    Silver Chloride recombines to Silver Chloride if left in the dark after exposure to light (breakdown to Silver and Chlorine) relatively rapidly; hence Silver Chloride transition lenses.

    I suppose Silver Bromide may do the same at a lower rate? Not sure about that though as it doesn't sound right.. it would then be at a lower rate than fog accumulates then, in that case net effect would be fogging + slow erasure of latent image over time.

  3. #3
    Steve Smith's Avatar
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    A couple of years ago, I was given three rolls of Kodachrome dated 1986. I used two rolls and noticed that the third roll was wound into the cartridge - probably exposed in the 1980s or early 1990s.

    I sent all three off for processing. My two rolls came back fine but the third roll had very feint images. I suspect that they were exposed properly at the time and that the latent image had faded somewhat.


    Steve.



 

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