Digital BW, The Print

David, Mark, Martin:
this is for public posting.
one of our project chemists found this web site that will be good for 
posting on the list, and probably adding it to the Files section.
this is the Library of Congress and their specifications for archival 
papers.  I would suggest clicking on the first option in the card 
stock category.


http://lcweb.loc.gov/preserv/supply/specific.html.  

Brief Summary of the specifications:  The stock must be free of 
optical brightening agents, the pH, cold extract, range 8.0-9.5, and 
calcium carbonate should be between 2 and 5% for Buffered papers and 
a pH of 7 and no CaCO3 for unbuffered papers.

these are some of the questions you all should be asking of the 
various paper mfgs/distributors.

thanks for your attention
robert rex

--------------------------------------------------
Antonis has placed the above link in the "Bookmarks" section of the 
group's homepage under the "Reviews and Info On-line" folder for 
future reference.

Okay, Robert, what is the cold extraction pH of Museo? ;-)

Also, as an aside, while the information you will find at this link 
clearly spells out what is needed for optimum paper permanence, we 
still don't know how these properties effect the image permanence 
using different inks or media.

Martin Wesley