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Removal of Green/Blue Corrosion From Brass "Delicate"

I have a brass Arts and Crafts lamp base which is signed. Base has rich patina except for three blue/green spots of corrosion on it. Must remove. But extreme care to be taken as not to damage the patina?

Joe P [last name deleted for privacy by Editor]
- Ellsworth, Maine, USA
2001

Ed. note: This RFQ is outdated, but technical replies are welcome, and readers are encouraged to post their own RFQs. But no public commercial suggestions please ( huh? why?).

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