Rolled copper bead

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I am looking for information on the best conservation method for a
rolled copper bead from a Contact Period Native American shell
midden.

The bead is flat sheet copper that has been rolled into a tubular
"bead." It is in good shape with normal green patina.  It is
currently being stored in a small sealed canister with soil in it.

As an employee of a Cultural Resource Management firm, I am looking
for the best way to ensure the bead's survival.  How should it be
handled, stored and "cleaned"?

Nothing will be done to it until proper procedures are researched.
Your help appreciated.

                                  ***
                  Conservation DistList Instance 11:40
                 Distributed: Tuesday, October 28, 1997
                       Message Id: cdl-11-40-018
                                  ***