Check EEF's paper white stability at
www.Aardenburg-Imaging.com. That white does not last long and the paper ends with a warmer white than any of the fiber/baryta papers available. One test going to negative numbers on the paper white, I would not touch it with a bargpole. There are more cooler fiber/baryta papers that show instability on the paper white, the Hahnemühle FineArt Baryta for example. Hahnemühle FineArt Pearl does it better in testing. Check the Fiber/Baryta paper first at Aardenburg before you start using it. A neutral paper could be more stable over time than one of the cooler papers.
An RC paper like Canon Heavyweight Satin Photographic (b -3) beats them all on paper white stability, the Gloss version (not tested) must be identical based on my spectral plots.
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Met vriendelijke groet, Ernst
340+ paper white spectral plots:
http://www.pigment-print.com/spectralplots/spectrumviz_1.htmupdate july 2012: Moab changes, paper sorting by name