(The word ‘whiz’ is used to describe the process because of the noise it was originally associated with)
Whizzing is a process used to simulate mint luster on a circulated coin through use of a wire brush (perhaps a rotary electric one) and / or an abrasive chemical. The top layer of metal is modified so that highpoint wear is not visible. Whizzed coins can often be spotted because the cleaning is often crude, the surface is highly porous and the coin often appears with loss of detail. Displays a peculiar graininess (grainy) (granular) and surface porosity. A whizzed Coin also shown points of unnatural rippled (dimpled) (undulation) effect.