Can someone advise me if this is the case? If it's inert,  I'm thinking of enclosing approximately 20 architectural drawings in Plexi, with acid-free mat board for backing and countersunk screws in the corners to hold the pieces together.  The drawings were used to produce blueprints and crumble when touched, so encapsulation with Mylar doesn't look viable.
 
Please reply to the list and not to me personally.  Thanks.
 
Casey Edward Greene
Head of Special Collections
Rosenberg Library
2310 Sealy
Galveston, TX  77550
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