The image on the left was printed on PGPP 3rd gen paper using 100% MIS replacement inks. The one on the right was printed on the same paper using Epson 1270 OEM inks. As you've probably guessed, the top segment of each image is the control image, stored in a sealed zip loc bag, inside a closed cardboard box. The bottom of each image spent 5 weeks in my ozone chamber.
While the MIS inks aren't fade proof, they're dramatically better than the OEM inks. And its important to remember that my test is very agressive, subjecting the prints to a relatively steady supply of ozone, and a constant flow of moving air. Only a few papers, used with the Epson OEM inks, better these orange shift results.