Digital BW, The Print

> Can anyone explain to me what
> in the process of Quad B&W printing using MIS Carbon inks would make
> the print less archival than a Photogravure. Is the weak link in the
> coatings, Ink, Solvent...What. Or is there no differance.

John,

An exceptionally excellent question!

http://www.curtis-collection.com/process.html

it appears to me that photogravure process has to use some kind of
halftoning technique to get tonality, as it only uses a single ink.  Does
anyone know more about this?  I have a book with photogravures in it, that
I'll take my magnifier out and look at, out of intellectual curiosity...

Austin