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Quality control is probably the most important single factor when considering high-grade electroplating. Due to the numerous variables, such as bath composition, time, temperature, current density, and base metal, it is necessary to monitor and control all phases of the process. As mentioned earlier in this chapter, a simple zinc-plating system may process parts through four or more solutions. Each of these solutions as well as the intermediate rinses must be controlled with concern for the variables mentioned. High-quality deposits can only be expected if these variable factors are all controlled. Whether a part is to be processed in-plant or sent out to a job shop plater, it is common sense to assure that quality control procedures are used.