One more thing to pay attention to is how the fabric is attached to the case since many adhesives have all sorts of nasty chemicals that react with objects.   The Field Museum has an amazing problem with "black fuzzies" on the Tibetan silver that was displayed in a case where the chemically inert fabric was glued with a sulphured based adhesive....
 
 
janice
 
Janice Klein
Director, Mitchell Museum of the American Indian
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www.mitchellmuseum.org
 
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