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The portion of a printed area that extends beyond / crosses the designated trim line on a sheet or page; bleed is used to allow for variations that occur during trimming or die cutting. Trimming machines unavoidably have some variance when cutting – it is almost impossible to cut along the edge / trim line exactly every time. Having bleed extending past the trim lines by at least 1/8″ will prevent the possibility of a white hairline around the edge of page (which would occur if there is no bleed present and the trimming is slightly outside of trim lines).