Metal Plate: A metal sheet with a specially coated 'emulsion' on its surface which when exposed through a film mask or by CTP process will produce an image. when the plate is loaded onto printing press it then reproduces this image using inks onto the paper.
Micrometer: Instrument used for measuring the thickness of paper.
Moiré Pattern: An undesirable grid-like pattern caused by the misalignment of dots on a printed document. This can occur when printing or sometimes when scanning from pre-printed material.
Matt: A non glossy finish