Spots, Spotting. Any of a number of small blotches of toning, tarnish or corrosion appearing on the surface of a numismatic or medallic item. Water spots are particularly unattractive, as well as sulfur spots (formerly called "carbon spots"). Removal of spots, stains, blotches is called spotting out and is part of refinishing.
excerpted with permission from
For Artists, Makers, Collectors and Curators
COMPILED AND WRITTEN BY D. WAYNE JOHNSON
Roger W. Burdette, Editor