Digital BW, The Print

I have been using Epson Ultra Smooth due to its archival qualities and have been fairly 
happy with it but I'm always on the lookout for something with just that little extra bit of 
D-max/black density.  Recently I tried a sample pack from Hahnemuhle and was very 
impressed with the blacks.  They seem to be slightly but still visually blacker than what i'm 
getting from UltraSmooth.  I will also be testing some Innova soon.  My question and 
concern(besides the flaking people speak about with the Hahnemuhle) is the use of Optical 
Brightners due to archival issues.  From the info published by Hahnemuhle, it would 
appear that Photo Rag AND German Etching list Optical brightners as a "Special Feature".  
William Turner does not list Optical Brightners as a feature.  That seems a little odd in that 
the German Etching is also described as "Natural White" which would lead one to believe 
that Optical Brightners were not used?  That's very misleading.  And as far as Innova is 
concerned, I can find no info whatsoever concerning the use or non use of optical 
brighners.  Does anyone know if Innova papers use Optical Brightners?  They do mention 
"Opti-coat".  Thanks,

Tariq