I do not know how to tell the difference between cellulose nitrate (1920s
to 1930s) and cellulose acetate (1940s to 1980s) but since the nitrate is
highly flammable I would treat all the films as hazardous.

If there is a need to preserve the images; first treat for the vinegar
syndrome, then silver dupe.
See TR13 'Preservation of Microforms in an Active Environment - Guideline'
for some help

Regards;

...John Glover
...707-773-1257
[log in to unmask]
516 Albert Way
Petaluma, CA 94954
www.linkedin.com/in/johnrglover


> [Original Message]
> From: Christian Meinke <[log in to unmask]>
> To: <[log in to unmask]>
> Date: 5/8/2009 7:26:59 AM
> Subject: [RM] Nitrate film for Micrographics?
>
> We've come across a collection of 16mm microfilm reels dated from 1947 to
> 1962, that are in a bad state of decay - an extreme case of vinegar
> syndrome. Because of the age (some prior to the 1952 discontinuance of
> Nitrate film stock), there is concern that some may be nitrite cellulose
> based and hence much more hazardous. Any of you folks with a broader
> background in micrographics have an easy way to determine if any of the
> film stock is nitrate - or even if Nitrate film was ever made for
> micrographic purposes? - to me everything is consistent with acetate film,
> but I've never dealt with Nitrate film so that may be ignorance on my
part.
>
> Thanks,
>
> Christian
>
>                            Christian Meinke, CRM
>                         Southern California Edison
>                           Information Governance
>                           (626) 302-7133/PAX 27133
>                            Mobile (818) 414-9515
>                          [log in to unmask]
>
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