M WeightThe actual weight of 1000 sheets of any given size of paper.
Machine CoatedPaper that has had a coating applied to either one or two of its sides during the papermaking process.
Machine DirectionAn alternate term for grain direction.
Machine FinishA paper finish that results from the interaction of the paper with the Fourdrinier process as opposed to post machine embossing. Reference, Fourdrinier
Magnetic BlackBlack pigments containing black iron oxides, used for magnetic ink character recognition.
Make RreadyProcess of adjusting final plate on the press to fine tune or modify plate surface.
MarginImprinted space around edge of page.
Mark-upTo write up instructions, as on a dummy.
Mask (1)The blocking out of a portion of the printing plate during the exposure process.
Mask (2)A photo negative or positive used in the color separation process to color correct. Reference, PRINTING, mask.
Match PrintPhotographic proof made from all color flats and form composite proof showing color quality as well as accuracy, layout, and imposition before plates are made.
Matte FinishA coated paper finish that goes through minimal calendaring. Reference, calendaring.
MeasureThe width of type as measured in picas. Reference, picas.
MechanicalA term used to describe finished artwork that is camera ready for reproduction, including all type, photos, illustrations etc.
Metropolitan Service AreaA group of ZIP codes usually in close proximity defining a large metropolitan area (e.g. New York City or Los Angeles).
Midtone DotCommonly taken as the area between highlight and shadow area of a subject's face in halftone image.
MoireAn undesirable halftone pattern produced by the incorrect angles of overprinting halftone screens.
MolletonA cotton fabric used on the dampening rollers of a printing press.
Molybdate OrangeAn ink pigment made from precipitating lead molybdate, lead sulfate and lead chromate.
MottleA term used to describe spotty or uneven ink absorption.
MullCoarse muslin glue placed on the back of book or pads for strengthening.
Mullen TestingA specific test of tensile paper strength; an important factor if web presses are used for printing.