Wanted to follow up on this thread after some further testing. Long story short here is what I did: printed two 10 ink step images in calibration mode in QTR on 5 paper stocks. One print was taken offsite to my apartment, one stayed onsite in my studio/office. Each print was measured 1 day after being printed and then 8 days after being printed. The papers tested were Canson Rag Photo (old), Canson Rag Photo (new), Innova Photo Cotton Rag, Epson Hot Press Natural, and Hahnemuhle Bamboo. I was primarily testing for stability of paper and ink over time in varying environments, but also looked at dmax and paper brightness and neutrality data. I should note measurements were based on D50 lighting conditions. The results:
Most Stable: Epson Hot Press Natural - this paper, both on and offsite didn’t shift more than 1 L, A, or B value over the 8 days.
Best Dmax: Innova Photo Cotton Rag - L value of 12.28 recorded, but both Innova and Epson hovered around L of 12.5.
Brightest and Most Neutral: Canson Rag Photo (old) - Paper base values: L: 97.88 A: 0.32 B: 0.43
Not sure if any of this information is useful to anyone else, but it is pushing me towards switching to hot press natural for my go to matte paper. I’m happy to share the full dataset for anyone interested.