Faded document

A customer has given us a printed circuit wiring diagram on paper.
It has been sitting inside a machine, for some 20 years or more. The
machine produced steam and hot air, and the diagram has taken the
full brunt of this atmosphere.  Ninety percent of the diagram has
faded, to almost nothing.  Virtually unreadable. They have asked if
we can bring back the print to readability level.

They indicated that some years ago they had seen a document with
faded printed ink similarly brought back to life, by the immersion
in some liquid.  They couldn't give the nature of the fading of this
earlier document. Does anyone know of this process?

Peter Krantz
Book Restorations
34 Clanville Road
Roseville
New South Wales 2069
Australia
+61 2 9416 9900
Fax: +61 2 9416 6800


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                  Conservation DistList Instance 18:25
                Distributed: Wednesday, December 1, 2004
                       Message Id: cdl-18-25-033
                                  ***