Can you explain the 'Burnishing' process?

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Burnishing is 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.

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