Mobile transparentizers

I am looking for information about mobile transparentizers,
materials used to make tracing paper and drafting vellum that "heal"
themselves if dented.  Can anyone point me to writers or references
about the nature of these materials?

Christine Smith
Conservation of Art on Paper, Inc.
2805 Mount Vernon Ave.
Alexandria, VA.  22301
USA
703-836-7757


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                  Conservation DistList Instance 13:59
                  Distributed: Thursday, May 25, 2000
                       Message Id: cdl-13-59-013
                                  ***