On Mon, 6 Mar 2000, Joel Wilcox wrote:
|At 03:16 PM 3/6/2000 -0500, you wrote:
|>On Sun, 5 Mar 2000, Joel Wilcox wrote:
|>
|>|My biggest complaint about the consumer Kodachrome (in the past -- I don't
|>|know about the new "Select" version) is that you never knew whether it
|>|would bias toward green (cyan?) or magenta. I had always thought I might
|>|experiment with a batch and check it when it is fresh, a year from
|>|expiration, 6 months from expiration, and at expiration -- just to see how
|>|long to "ripen" it before chucking it in the freezer.
|>|
|>|Has anybody ever done what I'm suggesting with Kodachrome?
|>
|>My understanding (and my practice) is that Kodak designs their
|>"consumer" films to mature about six months before the expiration
|>date. Consequently, I leave consumer films on the shelf until "minus
|>six months" then freeze them if I'm not ready to use them yet. I have
|>been doing this for years now, and I haven't had a problem with film
|>color since I started this practice.
|
|Very interesting, John. What Kodak films do you use? Since I assume you
|also use these films up until the minus six-month date, do they perform OK
|in their less-than-fully-mature state?
The consumer films are released by Kodak before maturity, and they
tend to have a greenish cast prior to maturity. If they are allowed
to age on the shelf beyond expiration date, the film will acquire a
magenta tint when used and processed.
The consumer Kodak film which I buy now (e.g., Kodachrome 25, 64, &
200, Ektachrome Elite) are placed on a shelf until six months before
expiration as previously stated. If I need to use slides in those
emulsion families before the "minus six month" time, I will use
professional film which is released at maturation.
All pro film and consumer film which has entered the "minus six month
time zone" is placed in the freezer for later use. When frozen, film
can be kept well past its expiration date.
This all follows guidelines set by Kodak which I read about years ago
in some photo mag (probably the extinct "Modern Photography") and
which were confirmed by a Kodak rep around that time. I actually use
the same general process for NON-Kodak film! as well with similar
results.
My own experience with pre-ripe and over-ripe consumer film was very
brief, very early and very short. With the process outlined above, I
simply don't have those problems anymore. :-)
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