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Tyler Rossi writes a brief explaination of the kinds of patina found on ancient bronze coins and their origins.

Perifereia dytikis elladasUnited statesAmerican universityDistrict of columbiaItaly generalUnited kingdomSpurius afraniusSeptimius severusTyler rossiRoman sestertiusAmerican numismatic associationRoma numismatics ltdSustainable international developmentBrandeis university heller school of socialDavissons ltdSheldon grading