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Re: Glassine

>I have some glassine that has yellowed. I thought that meant it wasn't acid
>free, so I stopped using it to interleave pages. Could it have been
>mislabeled by the store? Or are there 'grades' of glassine?

I wouldn't use glassine which has yellowed as it is probably also
becoming brittle.

Glassine paper starts out as a good sheet of paper which is dissolved
in a sulfuric acid solution, neutralized, and then calendered to give
it a finish.  In time, it breaks down and should be replaced (unless
it is an interleaf in a book, in which case the decision needs to
be made on a case-by-case basis.

Oh, and acid free doesn't mean acid free forever.


Jack C. Thompson
Thompson Conservation Lab.
Portland, Oregon

(503)735-3942 (voice/fax)


"The lyf so short; the craft so long to lerne"
Chaucer, <The Parlement of Foules> 1386 A.D.

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