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Slides, negatives and prints all are subject to color changes, even when stored in the dark. The two main effects are color shift and a yellowish haze over the image.
The original (top) exhibits a classic magenta shift, caused by the early decay of the cyan dye. Fortunately, it can be corrected digitally (bottom photo), using our standard service. Photo: our customer LTC Kane.
While these effects might take longer to happen than with typical light fading, they are maybe even more dangerous, since they usually happen to photos that you don't look at often. And so you might be inclined to let the damage go on for too long.
Chances are, your old color images were developed and printed using a chromogenic process. This kind of process relies on chemical reactions to produce a set of organic dyes — usually a blue, a red, and a yellow — that in combination produce the colors in your image. But these dyes, as they are the result of chemical reactions, are inherently unstable. Light accelerates their breakdown, but doesn't cause it. So even if you store your images in the dark, so long as they are at typical household humidity and temperature levels, they will eventually deteriorate.
Another side effect is that in many cases the image develops a yellowish haze. This is because in many (but not all) color films used during the period 1936-1990, the yellow dye can increase in density over time. Perhaps the most famous example of this are Kodacolor images from 1942-1953, which had particular problems, due to some of the dye-forming agents (called "couplers") remaining in the print after processing. (For this reason, this kind of color change is often referred to as a "coupler stain.")
Scanning, done the right way, can literally save your images. But simply digitizing your existing image isn't enough, since it is likely to have already faded, developed a yellowish cast, or been scratched. So digitizing it only would simply lock the image in its current, deteriorated state.
What's required is that your image be first scanned, then repaired. Many of these effects are straightforward to repair, if the operator is properly trained. At ScanCafe, for example, nearly every image submitted to us has required some level of correction, and we've been able to do the majority of that within our standard pricing, which costs just pennies per image. However, if you wait too long before you scan and repair your image, your image may be deteriorated to the point where it requires a higher level of service from us — we call it restoration. And in the worst case scenario, it may not be repairable at all.
Chances are, your analog images stored in the dark are already showing some color shift. However, there are a few techniques that you can try that should extend their life:
12Number of years displayed before typical color prints made from 1936-1990 start to fade significantly. source: Wilhelm Research
Color slides, negatives, and prints use three dyes to make their color. These dyes naturally decay at different rates, which changes the color of your image. from: Image Permanence Institute
98% Proportion of photos taken by amateur photographers in 1990 that were in color.
"I have done a lot of scanning in past years and it has taken me months upon months to achieve the professional results that you gave me in a few weeks. I am so grateful for this timely and cost-effective service."
- J. Adams, Orem UT (Sept 2007)