Digital BW, The Print

I guess I'l simplify the question. What would make a simple etching, 
say drypoint, More archival than an InkJet print using the "Archival 
Carbon Pigment" inks and Archival paper. Is it the ink we use, the 
solvent , the paper we use or the coating.What is the weak link here 
or do simple etchings or Lithos suffer from the same archival 
problems. I don't see people screaming about the archival qualities 
of a Picasso print be it an etching or litho.

                           John H