We’ve had good luck with the calcium carbonate method described in the conserve-o-gram. However I’d like to add an additional note of caution, since you mention this is a silver-plated trophy, not solid. The amount of silver on plated wares varies tremendously based on how much was initially applied and how much has worn/been polished away over the years. The last thing you want is to polish away the silver layer and expose the base metal below. So take a good look before you start to see if the silver is already worn away in any areas and in general go very lightly with the carbonate.  

 

Kathy Haas

 

Katherine Haas

Assistant Curator

Rosenbach Museum & Library

2008 Delancey Pl.

Philadelphia, PA 19103