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Re: [OM] Film -- Slide Permanence

Subject: Re: [OM] Film -- Slide Permanence
From: "John A. Lind" <jlind@xxxxxxxxxxx>
Date: Sun, 18 Feb 2001 17:27:57 +0000
At 23:48 2/18/01, Michael wrote:
on 2/17/01 12:21 PM, Bruce Appelbaum at brucea@xxxxxxxxxxx wrote:

>  The Ektachromes seem to be unchanged, even
> those over 20 years old.
>
>
Bruce,

Do preserve the Ektachromes in a digital format.  They do not last forever.
The Ektachromes I shot in Ethiopia in 1968-70 have faded badly and fungus
has appeared.

Michael

Older Ektachrome is not as stable and resistant to fade as the current generation. Fungus is another story. That likely has to do with storage and just as with lenses, fungus will attack transparency emulsions if it's stored in conditions that promotes its growth.

It turns out that Kodachrome is incredibly stable for archival storage, but that its projection life is about 2/3 that of Ektachrome. Thus, if you're shooting something that will be frequently projected, use Ektachrome. If it is intended for dark archival storage and won't be projected that often, use Kodachrome.

There is some additional information about archival here:
  http://palimpsest.stanford.edu/byform/mailing-lists/cdl/1993/0376.html

-- John


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