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A step in the analog printing process that allows films to be exposed to light sensitive paper then folded and bound. Relating to photography, prepress proofs are made from stripped negatives where all colors show as blue images on white paper. Because “blueline” is a generic term for proofs made from a variety of materials with similar appearances, it may also be called a blackprint, blue, blueprint, brownline, brownprint, diazo, dyeline, ozalid, position proof, silverprint, Dylux or VanDyke.