Digital BW, The Print

Does anyone know why Epson uses both acidic paper and acidic coating  
for its Archival Matte / Enhance Matte / Ultra Premium Matte paper?  
They keep changing the name, but as far as I can tell the paper  
itself has remained unchanged since they eliminated identifying  
watermark (?) on the back with the first name change.

Even the perfectly ordinary "Xerox" paper I use for printing text in  
my Laserjet tests out as non-acidic with a ph-testing pencil. Can it  
really be that much more costly for Epson to use an "acid free" base,  
especially when it would give them the advertising advantage of "New!  
Acid Free!" ??

I find this extremely annoying since I like the paper and it is  
probably more widely available than any other good quality matte  
photo inkjet paper.

Myron