Slide longevity.....

[nagle]

<p>Given fairly average, dark storage conditions (in cool Northern England) how long roughly, could my transparencies last before they degrade? I usually use Fuji films.<br>

thanks, Chris.</p>

<p> </p>

[charles_hohenstein]

<p>You might have better luck with Kodachrome, but recent E6 emulsions are supposed to be improved, as far as their keeping properties are concerned.</p>

[swilson]

<p>This is a good place to look for that kind of info<br>

<a href="http://www.wilhelm-research.com/articles_wir_additional.html">http://www.wilhelm-research.com/articles_wir_additional.html</a></p>

<p>Check out this one<br>

<a href="http://www.wilhelm-research.com/additional_articles/pp_dis_img.pdf">http://www.wilhelm-research.com/additional_articles/pp_dis_img.pdf</a></p>

<p>Without going into details they are rating Fujichrome at 19 years, but the detail are likely worth reading.</p>

[photo_smith]

<p>I have Fujichromes from 25 years ago and they look fine, they are just stored in plastic boxes. the Kodachromes I have go back to the mid 1950's and look like they were shot yesterday I have Ektachromes both E-4 and early E-6 that also are OK.<br>

I'd say stored in dry dark conditions Fuji slides will out last me.<br>

Mark</p>

[marc_bergman1]

<p>"Without going into details they are rating Fujichrome at 19 years"</p>

<p>Details are important. The Fujichrome that they rate at 19 years is Fujichrome Type 34 paper. See table F.</p>

[Robin Smith]

<p>I agree with Mark, my Kodachromes and E6 films are still fine 30 years later</p>

[david_henderson]

<p>My first Fuji slide films were shot in the late 1970's. They weren't very good then but the few I've kept seem no worse now. </p>

[leicaglow]

<p>A curator I know at a large art museum tells me that Kodachrome degrades at 1% per year in a dark environment. That doesn't mean it goes away at 100 years. It is logarithmic.</p>

[patrick_mont]

<p>If they are E-6 most likely a hundrend years.</p>

[randrew1]

<p>Henry Wilhelm collected the information that manufacturers published about their products. The compilation is included in the pdf file at: <a href="http://www.wilhelm-research.com/pdf/HW_Book_05_of_20_HiRes_v1a.pdf">http://www.wilhelm-research.com/pdf/HW_Book_05_of_20_HiRes_v1a.pdf</a></p>

<p>The criteria is the number of years it will take for a 20% loss in the least stable dye. Here are some of the numbers:</p>

<p>Fujichrome @ <10% rh: 150 years<br>

Fujichrome @ 70% rh: 40 years<br>

K-14 Kodachrome: 185 years<br>

E-6 Ektachrome (group II after 1988): 220 years<br>

E-6 Ektachrome (group I after 1978): 105 years<br>

E-4 Ektachrome: 30 years<br>

E-3 Ektachrome: 8 years</p>

<p>There is no humidity specified with the Kodak results, but I know that 40% rh was the standard condition used in these tests. </p>

<p>I'm old enough to have some personal experience with dye fading. I have some E-4 Ektachrome slides that are 35 years old that do not show obvious fading although I have not been measuring them. I have my grandfather's Kodachrome slides over 60 years old that show no signs of fading. I've never seen a Kodachrome slide produced since 1938 that shows dark fading. (Light fading is easy to show on Kodachrome--leave a slide on a light box for a week and you may see the difference.) I've never seen a slide from the original Kodachrome dye bleach process (pre-1938). I have some Ektachrome movie film over 30 years old that is losing yellow dye.</p>

[mwr]

<p>I have Kodachrome slides from the early 1960's, scanned last year at 3,000 dpi, that look like original to my eyes except for (1) some dust etc. and (2) more grain in the skies than I would have expected (but I don't really know what I should expect re grain). The slides were stored in their original Kodak small boxes, packed together in an unsealed cardboard box, in not-controlled but not-extreme mostly household closet conditions.</p>

[bob_osullivan]

<p>I have Kodachromes from the mid 70s and Fuji from the mid 80's. All look as good as the day I shot them. Cool dark dry storage.</p>

[a._t._burke]

<p>In 1955, my father was "conned" into using Ektachrome rather than Kodachrome by a prominent local photo store so they could get the processing income instead of Kodak. The results are here on Photonet at: </p>

<p><a href="http://www.photo.net/photodb/folder?folder_id=904377">http://www.photo.net/photodb/folder?folder_id=904377</a></p>

<p>Tom Burke</p>

[mwr]

<p>><a rel="nofollow" href="../photodb/folder?folder_id=904377">http://www.photo.net/photodb/folder?folder_id=904377</a> <<br>

How did you correct that bad color?</p>