Last year I bought a box of the 24x36 Juniper Baryta sheets for an exhibit. Due to the size of the paper I was temporarily storing the remaining paper (~17/25 sheets) upright on a shelf in my studio. The paper was stored in this way for anywhere from 4 to 8 months, as I was locked out of the building with the Covid quarantine. Then when I went to print with it again the top sheet was completely yellow. I'm imagining this is from the light in the room? My studio has several 5000k bulbs with a little ambient light from a window. I have seen inkjet paper yellow over time but it was a little concerning how quickly this happened. Just wondering - is this normal?

Ian,
Yellowing of the sheets is definitely not normal. Your Juniper sheets most likely yellowed due to airborne contaminants, and/or contact with other items on the shelf or the shelf itself. Photo papers, and especially cotton fine art papers are sensitive to airborne chemicals or contact with acidic surfaces (plastic boxes, cardboard, etc). If any cleaning was done in your building with aerosol products these could also effect the paper. We always recommend storing paper (sheets or rolls) in the original packaging (bag and box) or in another archival storage container. It is unlikely that incandescent light caused any issues, as there is little or no UV.