Newspapers were laminated. Cellulose acetate was used for lamination.
Depending on storage conditions and quality of the cellulose acetate
plastic film, the onset of VS will take an minimum of 40 years and as
long as 80. With an IPI A-D strip value of 1.5 or greater, VS has
started and the final stage will be reached in a minimum of 15 years
or as long as 60, based on the variables of storage and film quality.
There is a specific definition of VS, it is a free acid content of
0.5. This equals a IPI A-D strip of 1.5, blue strip with green edges.
IPI A-D Strips respond to acetic acid, but are not proof of VS,
although the correlation is very strong. Find them at
http://www.imagepermanenceinstitute.org/shtml_sub/cat_adstrips.asp.
It stands to reason cellulose acetate in contact with paper will slow
the "Onset of VS" stage. On the other hand, newspapers degrade on
their own producing acids and degradation by-products. Thus,
laminated newspaper have a sort of "double whammy." Some newspaper
were deacidified before lamination, forestalling their own acid -based
deterioration and possibly slowing Onset of VS.
Sheets can be delaminated in a solvent bath, but one has to check the
solubilities of the inks, etc. You'll need a conservator.
Scanning at 600 ppi would be an excellent measure. Humans can resolve
300 ppi, digital needs two-times analog for best resolution, as shown
by Nyquist <http://en.wikipedia.org/wiki/Nyquist_rate>.
I have written an essay on cellulose acetate (and VS) for film used in
photography, motion pictures and video tape. You can find it at
http://videopreservation.stanford.edu/library/history_science_storage_
of_acetate_base_film_16b.pdf, in the Library of the Videopreservation
Website. See Table 5 for the basic correlations between Free Acid and
A-D Strip values with a description of the physical condition of free
standing film.
Tim Vitale
Paper, Photographs &
Electronic Media Conservator
Film Migration (still) to Digital Format
Digital Imaging & Artwork Facsimiles
Preservation & Imaging Consulting
Preservation Associates
1500 Park Avenue
Suite 132
Emeryville, CA 94608
510-594-8277
510-594-8799 fax
[log in to unmask]
Albumen website (2001) http://albumen.stanford.edu/
VideoPreservation Website (2007) http://videopreservation.stanford.edu
-----Original Message-----
From: Museum discussion list [mailto:[log in to unmask]] On
Behalf Of Barbara Hass
Sent: Wednesday, June 24, 2009 7:21 AM
To: [log in to unmask]
Subject: Re: Newspapers & Vinegar Syndrome - Sources
In a message dated 6/24/2009 7:55:23 A.M. Mountain Daylight Time,
[log in to unmask] writes:
Hi,
Does anyone know where I can find information about vinegar syndrome
and
newspapers? Everything I find about vinegar syndrome deals with film
or
photos. I dealt with this at another museum I worked at where
hundreds of
documents dating from the 1850-1960s were stored in scrapbooks
(binders) in
plastic along with newspaper articles from the 1960s and were nearly
destroyed by acid, so I know it happens, just can't find any info on
it.
We just had some newspapers come in with a collection that are
half-way
laminated (for lack of better terms) and show signs of vinegar
syndrome. I
need something to back up my claims that they need to be scanned and
destroyed and certainly can't be kept with the rest of our collection.
I
thought there would be at least something out there about it but so
far
nothing online or in any of the books on my book shelf.
Thanks,
Lisa
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