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In the 19th century, a new way of making counterfeit gold coins was discovered that used platinum to replace the gold inside a genuine coin.

Rio pintoUnited statesUnited states mintNew yorkHarvard universityRogerw burdetteEdward prattHowell cobbJames ross snowdenJohn torreyProfessor of chemistry at harvard universityFoibles seneca mill pressYork assay officeTreasury departmentPlatinum filled goldAverage spot price