Reason: The dyes in color prints and slides are not stable, and will change when exposed to strong light or heat for long periods (one to five years), or with no further impetus even if kept in the dark for much longer periods (five to twenty years, and up).
Solution: In the case of color prints, you can sometimes make a new print from the original negative if you can find the negative and it was kept in a cool, dark place, or from the original digital file. Faded color prints and original slides can often be corrected digitally after scanning, because the color changes tend to take place faster in one color layer than another. You may be able to "add" missing colors by reducing the amount of the other colors in the photograph. There are a variety of Photoshop plug-ins that can help save faded images, too.
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