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Re: Longevity of Color Transparencies



There are no simple answers to the question of longevity of films.  A number
of factors, frankly, are probably out of your control.  These revolve around
manufacturing process of the film and quality of the photofinishing.  Not all
manufacturers are alike, nor are all emulsion runs from any one manufacturer.
 And the processing of the film will vary from lab to lab (what equipment was
used?  how fresh is the chemistry?  what brand is the chemisty?  did the
operator get a good night's sleep the night before?).  Assuming you are
willing to accept the original quality of the transparency, there are other
factors to be considered prior to giving a quick answer.

The first is the nature of the film. Is it a Kodachrome process (K-12 or
K-14) or an E-6 process (Ektachrome, Fujichrome, Agfachrome, etc.)?
Kodachrome is much more color-stable, whereas E-6 films will begin to
experience color-shift after 6 to 8 years, and will degrade rapidly.

The next factor is storage.  Ideal conditions will have the originals stored
in a cool (not cold) dark environment with a rational humidity level.
Extremes in any direction of temperature and humidity will accelerate the
process of image degredation.

You also need to consider the kind of mounts (if we're discussing 35mm);
ii.e., paper or plastic.  And then there is the issue of sleeving material,
or lack thereof.

Generally: a Kodachrome process is best.  Unmounted is best.  A fire-proof
cabinet in a humidity controlled environment is best.  Assuming all this, a
transparency will live longer than an average color print.

Jim Lewin
President
Image Delivery Systems
1101 Pennsylvania Avenue SE
Washington, DC 20003
vox: 202.544.6884
fax: 202.544.6889
LewinJim@cs.com

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