Tyvek may be inert but, after sitting in somebody's office for years, the
roll in question may well have picked up acid from air pollution or from
whatever it was sitting on.  Perhaps its just the outer layer(s) that are
now acidic, and the inner stuff is still OK.

Robin K Panza                         [log in to unmask]
Collection Manager, Section of Birds          ph:  412-622-3255
Carnegie Museum of Natural History       fax: 412-622-8837
4400 Forbes Ave.
Pittsburgh  PA  15213-4008  USA

-----Original Message-----
Elisabeth Engel Wrote:
When searching for materials suitable for shelf lining I came across a roll
of something I believe is Tyvek, which I inherited from the previous
Curator. I have never worked with this material.  I know that it sat in her
office, unused for several years and when I tested it with a pH pen, it came
up acidic.

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