Digital BW, The Print

The wax paper is a vapor/atmospheric barrier.  DuPont Mylar sheet would be
best but VERY expensive.  It slows migration of chemicals through the back.
Acrylic wall paint can emit solvents for 45-60 days.  Oil-based paints from
one to two or more years.

Composite frames are made from the same saw dust/glue particles that are
used in shelving/cheap computer desks, etc.  In addition to formaldehyde,
they contain some acids.  Woods, especially, non-hardwoods emit acids.  The
rabbet should be lined with a mylar or polyester tape before the mat is
inserted. 

Brown papers are not totally acid-free or pH neutral AND tend to draw
moisture.  The uncoated butcher paper is better (if it had acid it would
attack the meat you stored in it), and is a better vapor barrier.

Seth

==-----Original Message-----
==From: rikeller [mailto:rikeller@...] 
==
==OK, you've got me curious now. I'll bite:
==
==> 2.  There is a layer of wax paper and why (in case they start
==disassembling).
==
==Why?
==
==> 4.  The reason for metal frames and what they face going to wood or 
==composite
==
==What do they face?
==
==> 5.  The reason I do NOT put brown dust covers OR why there is white 
==paper(butcher paper w/o a "sweet" side.
==
==The reason?
==
==Thanks in advance!
==
==Rik
==
==
==
==
==
==
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