The recent info on the discovery of a way to speed up film emulsions 10X
describes the process as one where photons are knocking into the halide
molecules dislodging electrons that then join the silver molecules.
Most do not but rejoin the halide molecules. The added chemical makes
it impossible for the electrons to rejoin the halide.
Could there be further changes in the silver molecules if left
undeveloped for several hours or until all the "wondering electrons"
find a new attachment bond?
Gregg
Charles Loeven wrote:
>
> Are you sure it is the latent image that is deteriorating?
> Perhaps the film is just changing with time and conditions.
> Wouldn't you get the same result with an unexposed roll of film
> that was hanging around for a year as one exposed and shelved for a year?
>
> Slight hold time deterioration for six hours and then it stabilizes
> for _ what, several months? Then it gets really bad?
>
> Could be that the film is out of the air tight can for the first time
> and that may change it a little. Then after a long time the
> elements have done their work on it. Exposed or not.
> Try exposing a roll of film fresh out of the can and processing it right
> away
> and another shoot, reseal and freeze. Develop that one in a year and see
> what
> happens to it. I would guess that there would be a lot less of this hold
> time deterioration.
> Or take a roll and freeze it in the can and another take out of the can and
> let it sit on the shelf for a few months. Then shoot both and develop right
> away.
>
> This hold time for a latent image is new to me and I would question it
> further
> before taking it as a fact.
> If this has been "proven" I and I am sure all of us would be very
> interested.
>
> Charlie L.
>
> =========A "hold time" is the amount of time that elapses between exposure
> and
> development. If you want to see something interesting, shoot a roll of
> your favorite b&w film and develop it immediately--within the first
> hour. Keep an identically-shot test roll hanging around the house for a
> year. Develop it, than make comparison prints. Your eyebrows will
> probably go up! Most films show slight hold-time deterioration within
> the first six hours after exposure, and then stabilize for relatively
> long periods before beginning a gradual process of image deterioration.
> Tri-X is relatively immune to this--it looks virtually the same whether
> processed at six hours or at six months (although it does look slightly
> better when processed immediately).===============
>
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