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Although some parts, by their nature or function, can be designed in only one way, many more offer alternatives; the same function can be satisfied in several ways. Some designs offer great difficulties to the plater, while others are easily finished satisfactorily. It has already been mentioned that edges and projections will normally receive more deposit than other areas; thus if a certain thickness is specified, as it usually is, excess deposit must be applied to some areas in order to meet the specification. This entails longer plating times and consumption of more plating metal; from the purchaser's standpoint these translate into extra cost. Alternatively, the plater may be forced to use conforming or bipolar anodes, or thieves, shields, or other expedients. This also increases his costs, which he will pass along to the purchaser.