buffered vs unbuffered matboard

S_IZZO@guvax.acc.georgetown.edu
Thu, 05 Feb 1998 12:08:28 -0500 (EST)

I have a question about buffered vs unbuffered matboard. It has
been mentioned on occasion that unbuffered mats should be used for
cyanotypes. So far I have been using the buffered board that I have
for silver prints for my cyanotypes. I don't see any change in prints
that were matted and framed three years ago, but that obviously isn't a
very long time. I am assuming that with exposure to the alkaline buffer
the blue will turn brownish and become lighter (as it does when toned).

Actually, I have two questions:
1. How important is it to use unbuffered board for cyanotypes (and
albumen prints)? What changes will occur when buffered board is used?
2. How important is it to use buffered board for silver-based prints?
What changes will occur when unbuffered (non-acid) board is used?

I need to buy more matboard. Buying both buffered and unbuffered (in
both white and cream) becomes extremely expensive.
In addition to answers to my questions, any suggestions on places to
buy matboard at reasonable prices would be much appreciated. Light
Impressions sells 10-sheet packages (32"x40" 100% rag) for $85.80.

TIA Suzanne Izzo s_izzo@guvax.georgetown.edu