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Subject: Cellulose acetate

Cellulose acetate

From: James Elwing <elgur>
Date: Wednesday, June 13, 2001
I have begun using Bainbridge Artcare buffered sleeves (1 and 2 ply)
for cold storage of deteriorating acetate sheet photographic film.
These contain zeolites and 3.5% calcium / magnesium buffer. While
(via IPI A-D strips) it appears quite effective at absorbing acetic

    a.  Does anybody know any established limits of this material to
        absorb acetic acid?

    b.  On the understanding that acetyl groups constitute perhaps
        40%-44% of various cellulose acetate films, does anyone have
        an informed opinion as to roughly how much of this acetic
        acid needs to be given off by a film before it may be
        regarded as photographically deceased? (or is there no point
        at which this may be regarded as having happened)

James Elwing
Archives Conservator
Powerhouse Museum, Sydney

                  Conservation DistList Instance 15:3
                  Distributed: Thursday, June 14, 2001
                        Message Id: cdl-15-3-023
Received on Wednesday, 13 June, 2001

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