Removal of carbon-enhanced inks

We would be interested to hear if anyone has any experience in the
removal of carbon based inks that have been used to enhance iron-gall
ink writing.

One document for which this is being considered is parchment and was
written in iron-gall ink in about 1900.  This ink is now flaking from
the surface.  Carbon ink has been used to trace over parts of the
original iron-gall writing.  This was probably done about 40 years ago.
The document has a very unappealing look due to the different colours of
the two inks and the manner in which the carbon ink was applied.

Thanks!

Jan Lyall
National Preservation Office
National Library of Australia
+616 262 1571
Fax: +616 257 1703

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                  Conservation DistList Instance 6:61
                   Distributed: Sunday, May 23, 1993
                        Message Id: cdl-6-61-003
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