Amberina glass

Does anyone know of an effective and safe way to remove marks
(possibly ink) from amberina glass?  Soap and water has not worked.

Mary Harris-Serrao
Huntington Memorial Library, Oneonta, NY

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                  Conservation DistList Instance 13:3
                  Distributed: Thursday, June 24, 1999
                        Message Id: cdl-13-3-007
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