Cut and pasted from Light Impressions http://tinyurl.com/26odo7 ,
who has probably been the most effective advocate for making a distinction
between buffered and un-buffered mat board. Their description says it all,
though be mindful that with regards to storing photographs, it’s all
hearsay. I’m not saying it’s wrong, just unproven:
Westminster™ Non-Buffered Full Sheets -
When you're matting certain
types of photographs, such as albumen, dye transfers, or chromogenic prints,
and textiles, like silk and wool, use non-buffered board. Putting a buffered
mat next to the acidic dyes in these materials could cause a color shift. It's
manufactured with a pH value of 7.5 +/- .5, and because it is not buffered, the
pH value will drop when exposed to normal atmospheric conditions. 32" x
40" in 4-ply (55pt., 1/16" thick) only.
From: Bruce Campbell
Sent: Monday, April 23, 2007 9:40 PM
Subject: RE: buffered matte board??
I have heard this before BUT where does someone get
unbuffered mat board for use with cyanotypes? Maybe I just have not found
the correct source.
Also- does anyone make unbufferd storage boxes?
"Robert W. Schramm" <firstname.lastname@example.org>
Don't use anything buffered around cyanotype.
Check out my web page at:
>From: Hans Klemmer
>Subject: buffered matte board??
>Date: Mon, 23 Apr 2007 14:53:41 -0500
>Does anyone have a comprehensive list regarding
>which processes need buffered mattes and which need unbuffered mattes?
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