John -
I really understand your question here and concern. Let me try to elaborate a
bit more.
Window cards are made of a layer of very thin paper that the poster is printed
on. This paper is adhered to the card stock, giving it that thickness. The
really old window cards are usually pretty beaten up. As I said they have been
trimmed, but also very dirty, moldy, and with the paper being acidic, turning
brown, faded, bug infestation, etc, etc. The only way to properly treat all of
the above problems, is to remove the backing, and treat the poster paper by
washing, deacidifying, treating mold etc., just like a one sheet is treated and
then backed. You have to treat all of the issues to properly preserve the
paper, so that it will survive the years to come. To my knowledge, this is the
best way to do this. I know of no way to accomplish this by treating the thick
card, there is no assurance that water, chemicals, etc will penetrate the thick
card, you would have to leave it in solutions way too long, and the paper would
start to disintegrate. Adhering a layer of acid free paper and card stock, to
me, does not seem to compromise the integrity of the card, but I suppose that
can be debated.
If Dario, or anyone else has anything to add, that would be great. We are
always looking for the best way to treat and preserve these treasures.
Diane
Studio C
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