CFC's and Wei To

There is a non-CFC aerosol deacidification alternative to Wei T'o
developed by Preservation Technologies, Inc. (PTI) using the Bookkeeper
process.  The Bookkeeper process was developed by the Koppers Company in
the early '80s for mass deacidification, but never commercialized.
Originally it used CFC 113 as the carrier for the magnesium oxide which
is deposited in the paper.  However, PTI (which now owns the rights to
the process and has actively begun to promote it) has found a substitute
carrier which works equally as well--if not better  (tests have not
shown problems with adhesives, discoloration of certain inks, problems
with coated paper, residual odor, etc. which occurred before).  While
the goal is still treatment of books by emersion, the product is
available in a spray (either aerosol or non-aerosol).  Bookkeeper with
its new carrier has not yet been subjected to independent testing, but
arrangements are being made.  I'm sure the folks at PTI will be more
than happy to supply information about the process and how to order the
spray product.  Contact:

    Preservation Technologies, Inc.
    1114 William Flinn Highway
    Glenshaw, PA  15116
    800-486-1113 / 412-486-1161 / (FAX) 412-487-3313

Nancy L. Hallock
University of Pittsburgh  

                                  ***
                  Conservation DistList Instance 6:32
                Distributed: Saturday, December 12, 1992
                        Message Id: cdl-6-32-003
                                  ***