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Tue, 4 May 1999 09:52:40 -0700 |
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Upper Midwest Conservation Association |
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Stephen,
A good, reasonably low relative humidity environment is what helps in
preventing mold and the photograph's surface sticking to the Mylar
(ferrotyping.) For information, see NEDCC's website at www.nedcc.org ,
Section 4, Leaflet 11: "Storage Enclosures for Photographic Materials."
Alisa Vignalo
Field Services Coordinator
Upper Midwest Conservation Assoc.
612/870-3128
Stephen Linhart wrote:
> Hi -
>
> It's common knowledge to not place photos and documents on paper in
> contact with glass or plexi. Yet with polyester encapsulation documents
> are placed in direct contact with the Mylar.
>
> Why is this ok? Polyester film, such as Mylar, is permeable to moisture
> and there's also the recommended small gap in the seal. So what protects
> against mold growing where the film meets the document, and what prevents
> transfer of image to the film?
>
> In short, why is it ok for Mylar to touch the document and not ok for
> Plexiglass?
>
> - Stephen Linhart
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