Burnished Gold Eagles

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Burnished
This word has two distinct meanings in the world of numismatics, so you have to consider the context in order to discern the correct meaning. The word "burnished" can refer to specially prepared planchets (usually 18th century) that were used for specimen coins or other special coins of the era. These planchets were burnished at the Mint prior to the striking of the coin. As a second meaning, "burnished" can refer to any coin that was abrasively cleaned after it left the Mint, and the word is often used as a synonym for "whizzed" (the worst kind of cleaning, where the metal is actually moved around).
burnishing
A process by which the surfaces of a planchet or a coin are made to shine through rubbing or polishing. This term is used in two contexts - one positive, one negative. In a positive sense, Proof planchets are burnished before they are struck - a procedure done originally by rubbing wet sand across the surfaces to impart a mirror like finish. In a negative sense, the surfaces on repaired and altered coins sometimes are burnished by various methods. In some instances, a high-speed drill with some type of wire brush attachment is used to achieve this effect.