The two fiber papers with near identical spectral plots are the Harman FB Gloss qualities and of the two Aardenburg tested the Harman Gloss FB Al 320gsm quite well so far. Paper White included. The other gloss one wasn't tested. I would say there is a good chance the matte variety will do well too.
Medium content FBA says Aardenburg. The papers also have a good addition of normal whitening agents so do not rely that much on the FBA. A higher FBA content in the paper base can serve as a buffer but that construction may be better used for RC papers where the FBA is encapsulated between the PE barriers and so less open to gas fading. The three Harman papers mentioned here have more FBA in the paper coating than in the base. I think Alan made a mistake there.
An example of a Fiber paper that clearly relies on FBA content is the HM Baryta FB 350gsm, it also has a slightly higher FBA content in the base than in the coating.
met vriendelijke groeten, Ernst Dinkla
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