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Assuming that electroplating has been chosen as the preferred method, the choice of the particular coating must next be made. This will be determined by many factors, principally: 1. Nature of the Substratein particular, its composition, size, and configuration. 2. Purpose of the Finishpreviously considered in Chapter 2. 3. Cost Performancethe cheapest metal commonly electroplated is zinc, the most expensive, rhodium; all other commonly plated metals fall between these extremes. One would normally choose the cheapest metal that will do the job. It should be mentioned that, although the total cost of a plating job is not determined solely by metal cost, since overhead and other factors enter the equation, metal cost remains an important variable.