According to the HP website, the Vivera Inks are dye based, which should mean results as good or better than the older inks (e.g. 23 & 78). However, as I said, I don't get the great results I used to get since "upgrading" to a Vivera printer.
And the HP 10 & 11 cartridges, which were reported at the following link to lose a whopping 50% of their color when washed, are also dye based.
http://softexpressions.com/help/faq/FAQbjs.htm#c82
I guess all dye based inks are not created equal - not even all the inks created by a single manufacturer!
Guess I'd better figure out how to get better results out of the printer I already have. LOL