Adhesive for glass plates

We are looking for tape adhesive safe for conservation treatment on
autochromes and glass plate negatives to seal glass plates together.
I would like to know if some test has been done on 3M 550 (acrylic
adhesive on polypropylene support) or on Filmoplast P90 as
Photographic Activity Test or another test of compatibility with
silver, pH, chemical composition etc.

Marsha Sirven
Atelier de Restauration et de Conservation de photographies de la
Ville de Paris
5 rue de Fourcy
75004 Paris
+33 0144618120
Fax: +33 0144618121


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                  Conservation DistList Instance 19:1
                 Distributed: Wednesday, June 15, 2005
                        Message Id: cdl-19-1-007
                                  ***