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Offset lithography is a photographic printing technique that uses inks, carried by rubber rollers called printing blankets, to transfer images from metal plates to paper. Offset reproduction refers to a photomechanical process of reproducing an original image by first "breaking down" or "separating" the artist's blend of colors into four constituent colors and then recombining them on a printing press to approximate the original work of art. Because of the significant time and expense involved in setting up a print run, printers will make hundreds of copies of the same artwork. The longevity of any given print depends greatly on the quality of the paper and inks used. This type of print is an affordable choice for those looking to enjoy art without the prohibitive cost of purchasing an original.