I've been doing some printing of pen and ink drawings for a local artist for the past couple of years. Started out using Breathing Color Optica One for the "fine art" prints and Epson Enhanced Matte for the "decor" prints. Because of the severe curl of the Optica One paper, I switched to using 17x22 sheets of Epson Cold Press Bright and Natural, mainly because the artist liked the texture of the Epson paper. Printing is done on an HP Z2100.
In dropping some prints off to her today, she showed me several of the Cold Press Bright prints that had started to yellow on the edges. She stores the prints between a couple pieces of corrugated cardboard and, while not kept in the dark, receive little to no light exposure. What's also interesting is that in some cases there are prints of Epson Enhanced Matte stored in the same cardboard folder as the Color Press Bright prints....the Enhanced Matte paper (cheap with loads of optical brighteners) shows ZERO yellowing while the Cold Press Bright prints next to them shows yellowing. I know that the Bright fine art paper has some measurable OBAs but I would assume it would be of a higher quality than the Enhanced Matte paper.
Anybody ever experience yellowing on Cold Press Bright paper or could offer an hypothesis on why this might be happening? It's allows along the non-inked border areas so I don't believe it's a chemical reaction although the prints are stored next to each other with no paper interleave. Intermixed were some old prints on BC Optica One that looked fine.
This is too bad because I really like this paper and print some of my own photography on it....hoping to find a cause so I don't have to switch to something else.
Regards,
Terry Wyse