Digital BW, The Print

The well-known "Epson Photo Paper" (S041141 in letter size) is 
a semi-gloss paper that I believe Epson is presently marketing 
under the name "Glossy Photo Paper".
My question is whether or not this particular paper is properly 
classified as "nanoporous" type. I had been under the 
impression that a later product, "Premium Glossy Photo Paper" 
(of orange-shift notoriety) was Epson's first product of the 
"microporous" (or nanoporous) type. I thought that the earlier  
paper (Photo Paper) is swellable and is _not_  a 
nanoporous/microporous variety. Anyone know for sure?

Phil