First off, you should know that some items don't need to be cleaned well enough to remove verdigris from the surface. These include many objects that have developed this patina over time, as noted by Irv Graham , an appraiser and expert on Chinese antiquities. As with many types of copper antiques, this can completely devalue them as collectors view this green as beautiful rather than dirt. As Graham suggests, before doing any serious cleaning of any antique or collectible that could be extremely valuable, it's wise to consult an expert to avoid ruining it.
If you've recently purchased a brass item for your home, chances are all it needs is regular dusting to keep it looking good for a while. When a bronze item needs more attention, you might be surprised to find that the solution is literally simple.
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