Copper bell

The Antiga Si Church, in Rio de Janeiro, Brazil, has five copper
alloy bells that we wish to clean without losing its green oxide
patina. Dirt comes mainly from automotive pollution and pigeon
droppings.

We tried to apply a cloth soaked with water and neutral detergent
than gently rubbing with nylon brushes. The result was almost null.

Do anyone has an experience to share about this or similar issue,
like cleaning statues?

Eng. Carlos Dion M. Teles
Caixa Postal 493
Sco Carlos - SP 13560-970
Rio de Janeiro
+55 21-9312-3919


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                  Conservation DistList Instance 17:52
                 Distributed: Sunday, February 1, 2004
                       Message Id: cdl-17-52-023
                                  ***