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Depending on the work they are intended for, various kinds of plates and processes for preparing them exist. Monometal plates are made of a metal with hydrophilic (water-receptive) properties, such as zinc or aluminum, the surface of which is treated to make it more porous. The plate is coated with a thin layer of a photosensitive substance, covered with a negative of the texts and previously screened photographic illustrations, and exposed to intense light. This hardens the photosensitive substance in the areas of the negative where the light passes through; that is, in those corresponding to the printing areas. The ...(100 of 26569 words)