Thanks for all the great info.
I did some tests, and looks like you're right, the fading has to do with the paper, not the ink.
I'm using Epson Photo Paper (not Epson Premium Photo Paper), and it seems to resist fading really well. I wonder if it's "swellable polymer paper", since when I first...
I've been using these generic inks for my Canon IP3000 for years, they work great, look really good, don't jam my the heads more than other inks (I think), but they have one big problem: if exposed to sun, they fade pretty quickly. So put a generic ink picture on the fridge next to a picture...