In case you missed this developement-I did. The numbers below are for an inkset developed by Paul Roark on a No OBA mat cotton paper. The significance, as I understand it, is that these numbers approach the test results of traditional silver prints processed archivally. Thats after 120 megalux hours of exposure-like some 51 years. No shit. Now this is not a Wilhelm test-this is Aardenberg the gold standard.
For the the most lightfast inkjet prints, specify maximum carbon content, matte paper, and no third party color including blended gray inks. See http://www.aardenburg-imaging.com/ for comparative fade testing. While ultimate longevity is not the most important factor for most prints, where it is critical, do the research. As a benchmark, see test ID#144 (click on AaI_20091208_SN003Lf) and note the average delta-e of 0.3 after 120 Mega Lux hours of exposure. Not all 100% carbon pigment inks and prints do quite as well as this, but the real trouble may be from the colors in gray inks that can fade differentially, causing a print tone shift, sometimes to greenish. It takes a lot of good R&D to match the fade rates of color pigments that are used to cool carbon, with HP Z3200 gray/PK pigments probably being on top of that list and what I use. Also not that it generally takes more color to cool carbon on glossy paper than on the best matte papers.
Paul
www.PaulRoark.com
http://www.paulroark.com/BW-Info/
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