I have been using Epson-made Noritsu D701 dyes (which appear to be the same as Claria) for my printers with very good results (see for example http://www.paulroark.com/BW-Info/4000-Noritsu-5K-Plus.pdf ), although I make no claims that these are particularly "archival." In fact, they are the cheap end of my attempt to divide my markets, with carbon being at the higher end.
So, I was particularly intrigued by the Epson UC D6 MSDS that states that the D6 black is a carbon black. A carbon black that could print on glossy paper with no gloss differential or other annoying artifacts would be quite an achievement.
I have now obtained a sample of the D6 black ink, and my conclusions are that the MSDS is in error. It is a dye very similar to, if not exactly the same as, Epson's Claria and Noritsu black dyes.
See http://www.paulroark.com/BW-Info/UltraChrome-D6-Noritsu-blacks-compared.pdf for copies of the relevant parts of the MSDS and some comparisons of Lab L, A and B graphs of the inks.
Paul