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To: Ilaine who wrote (51676)6/2/2000 1:16:00 PM
From: Jacques Chitte  Read Replies (1) | Respond to of 71178
 
I believe that there is a two-stage oxidation process. The browning is fast. But centuries-old bronze that isn't maintained takes on the classic verdigris color. Most statues get a cleaning every few years, and that prevents verdigris.
Old cannon barrels don't always get that level of maintenance, so it might be easier to find a green cannon barrel.