The following is an excerpt from an article found here: http://news.yahoo.com/news?tmpl=story&cid=1093&e=2&u=/pcworld/20050708/tc_pcworld/121752
Claims and Counterclaims
The latest salvo in the longstanding debate comes from HP and Epson; the companies dismiss claims by third-party paper vendors such as International Paper, Kodak, and Staples that their papers will produce archival-quality prints on any inkjet printer.
Specifically, Epson and HP strongly dispute Kodak's claim that prints made on their printers with Kodak's special paper will last 120 years before fading. Similarly, the printer vendors dispute International Paper's claims that prints made on the company's recently introduced National Geographic Premium Paper High Gloss will last "more than 100 years." (Staples, while claiming that photos printed on its papers "resist fading," makes no specific claims as to how many years a photo printed on its paper will last before showing signs of fading.)
"We've heard a lot of promises from our competitors," says Nils Miller, HP's ink and media senior scientist. But so far he says he hasn't seen a "miracle paper" from a third-party supplier that can deliver the same print longevity and quality with all printers.
Epson says users of its paper, in combination with Epson premium inks, can expect images to last up to 104 years before showing signs of fading. HP says its premium inks used with HP photo paper will last 115 years. These claims are based on internal testing by Epson and HP and on tests by Wilhelm Imaging Research, an independent laboratory based in Grinell, Iowa.