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UV harms Pigment Inkjet prints
Remember the semi-controversial "window" study by Edwin Iracki of
Dupont Fluoroproducts, which said Epson Ultrachrome pigment ink showed 20% yellow fading in two years, and near 100% in 7.5 years? We discussed it in November 2006. Yet another study (from last winter) shows that UV causes fading of "professional giclee" pigment inkjet prints: http://www.goldenpaints.com/justpaint/jp14article2.php Summary: under a Q-Lab UV-A 351 bulb, (Epson?) pigment inks on watercolor paper faded at about half the rate of dye-based inks on glossy photo paper, which is to say REALLY FAST. Magenta faded most quickly, followed by yellow, then cyan, then black. After 400 hours, all colors faded about half as fast as dye ink. After 1200 hours, magenta had changed 60 (Delta E) versus 92 for dye ink, more than half, and yellow had changed 40 versus 54, much more than half. EOS. The relatively superior performance of pigment inks could be entirely attributable to the paper, rather than ink longevity. Dye-based inkjet prints on matte paper last at least twice as long as dye-based inkjet prints on glossy photo paper. |
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