Posted 26 April 2012 - 01:01 PM
I am knowledgable but not expert in conservation. Much of my material is in archival storage methods
and materials, bought from probably the finest firm of that sort in the US, whose name I have cleverly
forgot for the moment.
One suggestion. There are two basic kinds of "acid-free paper", one is simply certified acid-free, with
a neutral Ph. The other is "buffered", in other words the paper is impregnated with buffering agents,
which will actually neutralize acids. I have long felt that interleaving acid loaded material with sheets
of the buffered paper would be useful; using merely acid free paper would probably have some acid leach
into the paper.
But dealing with old acid-loaded paper, especially newsprint, is an uphill struggle.
Another tip; most plastics will damage photos and perhaps newsprint as well. Most contain agents called
"plasticizers", and these are damaging. Many of my old photos are in special sheets of the right material
with pockets of various sizes, snapped into an archival cased binder. Unfortunately, since I have not bought
any of these materials in a long time (I bought quite a supply), I have forgotten the term for this sort of
plastic. ( I can hunt about for an old catalog.) A clue is that the right plastic is rather
stiff, due to the missing plasticizers, of course.
There are a lot of these "magnetic" plastic photo items and sheets, which damage photos.
Just got off my butt and looked in a drawer five feet away, and there is an envelope of these archival photo
sheets. The firm is Light Inpressions, and the pocket sheets are described as "Archival PhotoGuard
(Trade-marked) Polypropylene Storage Pages". Below it mentions, in a list of virtues, "Archivally safe -
no harmful PVC". PCV means "poly viynal (spelling?) chloride", a common plastic. That is the bad stuff.