Quote Originally Posted by Thilo Schmid

Ed,
I wonder about this comment. I didn't find Ilfocolor very stable at least not compared to Signum II/Crystal Archive. If I take a look at the datasheets, Ilfocolor would loose aprox. 0,15 logD in 6 years if exposed to 450 lx/12hr/day. 450 lx is a very low illumination. ~10,000 lx would be a usual daylight illumination (as used in the Fuji Data Sheets where Crystal Archive fades the same amount in 9 Months(!)). I had some Ilfocolor hanging in my staircase (no direct sunlight) besides Signum II and Crystal Archive prints. The Ilfocolor prints did not perform better than the other two. Did you ever compare a print on your office wall to new one from the same neg?
I've just waded through Ilford's and Agfa's web sites .... I have a head ache.

I found "fading" information on Ilford's site, but not on Agfa's (other than, "Our paper is awful good when it comes to fading") - and I couldn't navigate to anything worthwhile on Fuji's. Could you help with a few specific addresses here?

I have a few questions - Ilford decribes their paper as "Ilfocolor E" ... and I'm not sure that is the same stuff that I have cached in my refrigerator. Agfa lists "Signum II", which, again, is not the same as what I had used.

Probably, there have been, over time, advances in "permanence" qualities.

I can only say that the Ilfocolor prints I have hanging appear to be "fresh". I really cannot duplicate processing - those in question were processed with Photocolor (early) and JOBO/ Russell, JOBO/Trebla - and JOBO (Tetenal) chemicals - and I have no doubt that the chemical process has a significant effect on color balance and longevity.

The "Fading" information I was able to glean specified testing by an independant lab" and environmental light exposure of "450 and 500 lux - intermittently - for twelve hours" - as an arbitrary value - more or less equivalent to "hanging on the average wall".
I just checked my studio walls with my Gossen Ultra Pro - set on "lux" and (10:00 AM - sunny day otuside) I have observed values ranging from 45 (shadier places) to 18,000 lux (sunlight streaming through window) - with an average of 450-500 - so the testing parameters seem to be somewhere near to reality - but -- there is no indication of the spectral composition of the interior light. Interior lighting has little UV - filtered out by "ordinary" glass.

Interesting to note that Ilford has a number of protecting laminates for applying over the emulsion to increase resistance to fading.