Digital BW, The Print

Seth,

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

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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> 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...

Some years ago I used cheap cardboard in framing and put either wax paper or
aluminum foil between that and the interior materials.  I took them apart
after a number of years and found the acids had migrated right through the
wax paper, but not through the aluminum foil. 

Paul
www.PaulRoark.com

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark" 
<paul.roark@v...> wrote:

> 
> Some years ago I used cheap cardboard in framing and put either 
wax paper or
> aluminum foil between that and the interior materials.  I took 
them apart
> after a number of years and found the acids had migrated right 
through the
> wax paper, but not through the aluminum foil. 
> 
> Paul
> www.PaulRoark.com

For my 'real' job I work for a company that fabricates space 
hardware. Where absolute contamination control is needed aluminum 
foil is commonly used for packaging. Commercial aluminum foil is 
very clean and free from contaminants and provides an excellent 
barrier material.

Regards

Martin

Probably.  CutRite isn't the primo paper it was. Imagine what it would have
been w/o the wax paper.

I think the tin foil is the cheap alternative to Mylar.

Seth