Benzotriazol

I am involved with treating three archaeological bronze bracelets
which show signs of active corrosion. They have already been
consolidated and glued with Paraloid B72 (Acryloid B72) in 2000, but
no stabilisation treatment was carried out. With comparing pictures,
substantial loss due to corrosion is obvious. As for instance we
cannot guarantee stable climate conditions, a stabilisation seems
necessary.

Can a bath of benzotriazol, BTA 3% in ethanol during 24 hours
(according to D. A. Scott, Copper and Bronze in Art), penetrate
enough and if so, is this stabilisation effective even on a
consolidated object?

Sabine Brechbuhl
Archaologischer Dienst des Kantons Bern
Restauratorin Dipl. FH
Brunnenstr. 66
3001 Bern (Switzerland)
+41 31 633 98 22 (direct 38)
Fax: +41 31 633 98 20


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                  Conservation DistList Instance 21:4
                   Distributed: Friday, May 11, 2007
                        Message Id: cdl-21-4-020
                                  ***