While the whole inkjet industry runs around claiming centuries of archivability, I've found that every non-matte surface I've tested has yellowed, some quite significantly. Most matte surfaces have yellowed as well. Most of my prints are in a very dark corner of the room and the air quality here is fine. I'm sure acid-free/cold/low humidity storage will help but really, what good is a 200 year archival ink on 3 month non-archival paper? Other than common sense (acid-free etc.) specs, does anyone know of a reliable website that has any info regarding archival papers and not inks? I prefer to print on semi-matte/luster type papers but have yet to find any that last.