<Believe the problem is caused by off-gassing of the glue that holds the
film to the cards.>
It can also be caused by off-gasing of the sulphuric content of the card
itself. Many older aperture cards were not sulpher-free or acid-free
stock.
Ginny Jones
(Virginia A. Jones, CRM)
Records Manager
Information Technology Division
Newport News Dept. of Public Utilities
Newport News, VA
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