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"Paul Revere, Jr.: Hot-water urn (1990.226a-d)"
In Timeline of Art History
New York: The Metropolitan Museum of Art
(September 2008)

Firestain is oxidized copper (shown as the blotchy areas on the urn above) in solid silver that can be found on many pre-colonial through early twentieth century pieces. If, after cleaning your silver (not silverplate) piece, a purplish stain remains, do not mistake this stain (cuprous oxide) for tarnish! Attempting to remove it will only damage your prized piece. It is not generally seen on pieces that have been produced by the large American silver companies after the early 1900s, but many one-person silversmithing shops still use this technique. I will not get into the technicalities of firestain here, except to say that the stain is usually obscured with fine silver either by silver plating the object or through a process called depletion. The firestain under this fine silver layer, which may be a few thousandths of an inch thick, may not show up until after many years of polishing.