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Re: [BKARTS] Can acid-free tape bleech acidic paper?

It's a long shot, but perhaps the blue paper has Prussian blue pigment
in it.  This pigment can be sensitive to alkalinity (from the archival
tape, with a calcium salt filler). Not exactly in a bleaching sense
though.  It has always been practice to not deacidify blueprints
(cyanotypes), for example, as it will cause the color to fade.  If you
have any of the paper left, place a drop of ammonia (a base) on it, and
see if it turns white.
Contact between alkaline materials and cyanotypes is also frowned upon,
but from what I've read, there really aren't any documented cases where
fading has occurred by contact.

Again, it's just a hunch...

Douglas Sanders
Senior Conservator
Indiana Historical Society

> -----Original Message-----
> From: Scott Teplin [mailto:teplin@xxxxxxxxxxx]
> Sent: Wednesday, March 08, 2006 3:22 PM
> To: BOOK_ARTS-L@xxxxxxxxxxxxxxxx
> Subject: Can acid-free tape bleech acidic paper?
> I used a light blue book weight (80#?) paper in a book - and for some
> reason - I thought it was archival. Inside the book, I used acid free
> LAR Tape (I bought it from our friends at Talas - see link below).
> forward 4 months: I open the book (had been closed and in an archival
> clamshell  book box) to discover that the back side of the blue paper
> where the tape is stuck to the other side, has been bleached, only
> where the tape appeared.
> -Scott Teplin

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