Removing sulfate from azurite polychromy

Susan White <smwhitewhite [at] netscape__net>

>I am treating a 14th c. marble Madonna for the Duke University
>Museum and have a situation where a thin, discolored (by iron oxide
>and carbon) sulfate layer covers original azurite polychromy. ...
>...
>... Does any one have a suggestion as
>to how best to attempt the removal of the sulfate layer over the
>azurite so as not to risk loss of the pigment?

If you have access to laser cleaning equipment it would be worth
testing it on the sulfate layer.

E. Miller


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                  Conservation DistList Instance 16:3
                  Distributed: Thursday, June 27, 2002
                        Message Id: cdl-16-3-005
                                  ***