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The merits of zinc and aluminium have been debated since their introduction to lithography. Each metal has had strong advocates, and excellent work has been produced over the years using both materials. From the practical viewpoint, there is little difference between the two metals in cost, outlay of processing materials, and easy of printing. It is safe to say that each type of plate, when handled knowledgeably will perform equally well. The choice of wether to stock one or both types of plates and suitable processing materials for each is largely dependant on the subjectives of the lithography shop. It might be advisable for school shops to stock only one metal in order to minimize cost and to avoid confusion and contamination of the processing materials necessary for both types of plates. The following chart comparing the merits of the two metals will serve as a basic guide:
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