Digital BW, The Print

--- 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