Lots of RC papers that have a b -10, the most extreme I have measured is b -10.7.
The b value is an indication only, it doesn't tell enough about the mix of normal whitening agents + paper fiber and fluorescent brighteners and the effect to changing illumination with UV and without UV. A nice example is the Hahnemuhle Baryta FB 350 grams, its paper white is the result of the paper fiber reflectance at the red end and a huge dose of FBA at the blue end, hardly anything in between that contributes to the paper white reflectance. You can expect a huge color inconstancy in changing light. It has a b -8.9. The EEF has at least some whitening agents in between the visible spectrum extremes, though only in the inkjet coating.
The UV-cut measuring devices still deliver "measurements" below where they are actually cut to make profile creation software work. As I understand from an ArgyllCMS forum thread the ColorMunki doesn't measure below 430 Nm and repeats the value measured there down to 380 Nm. Papers without FBA already drop in reflectance over that wavelength range, not to mention FBA loaded papers. I expect it will be somewhat better simulated with an UV-cut Eye1 Pro. I think a lot of the purple/blue sky profile issues may be more related to the measuring devices + paper FBA content than to the profile creation software. A choice of 3 varieties of FBA paper content to simulate could be an option. Remains the problem that you can not predict the display conditions. On the other hand measuring FBA papers with an UV-cut device and expecting that they will not be used in light with UV content is not realistic.
Argyll's simulation of an UV-cut measurement based on a normal spectrometer measurement at least starts from measurements within that part of the spectral range. Sounds better than the other way around. But I think it actually should simulate the paper white reflectance if the FBA was removed from that paper. Which is something else. I think it is possible to estimate what the "measurements" would be in that case, I have measured a lot of inkjet papers and their paper base and FBA paper qualities are often based on non-FBA paper qualities. Quite obvious where the FBA effect kicks in at the shorter wavelengths and start absorbing UV light at even shorter wavelengths.
The safest route is reduced or no FBA content in the paper and measuring with a normal spectrometer that has no UV-cut. It at least measures into that part of the spectrum, there is still violet-blue reflectance to measure even if there is no FBA effect. It is also the best paper choice when display conditions are not predictable, it will be less influenced on its white reflection by framing behind acryl or glass, it should (in general) keep a more constant white reflectance in time. Aardenburg has a nice page on FBAs and light and framing.
http://www.aardenburg-imaging.com/news.18.htmlmet vriendelijke groeten, Ernst Dinkla
New: Spectral plots of +250 inkjet papers:
http://www.pigment-print.com/spectralplots/spectrumviz_1.htm