I've used Wei T'o (the spray version) on newspaper and old books.
    I chose the spray version because I didn't have the nerve to
    submerge old paper into a bath.  I chose Wei T'o only after
    talking to a number of people who had used it, including Bob
    McWilliams at Light Impressions--who has used it in both museums
    and on some old books that he personally owns.  As to the long
    term effects, who knows--I'm no scientist.

    Regarding scrap books:  We have old scrap books that have
    clippings glued in--the glue eventually lets go.  However,
    clippings that we collect today are simply saved in acid free
    envelopes.

    John Handley
    Museum of Ophthalmology