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Wikipedia describes this as "illuminant metameric failure". Images that look the same under some lighting (eg. halogen) may look different under other lighting (eg. the LCD light inside your scanner).
spoiler"Both of the papers I use with the Epson 1270, Matte Heavyweight and ColorLife, suffer from a degree of viewing illumanant sensitivity, also known as metamerism. Neutral tones change their appearance under different light sources. If they look distinctly reddish under halogen lights, they are nearly neutral in daylight."
petopeto
http://www.normankoren.com/color_management_3.html talks about one cause of this, which I suspect is the issue here:
http://qualityinprint.blogspot.com/2009/03/issues-of-optical-brightening-agents-in.html talks about another: OBAs, which make a print look bluer under a light source containing UV. This is common in newspapers, apparently, and can be detected with a blacklight.