K
Abbreviation for black in four-color process printing. Hence the 'K' in CMYK.

Key
(1) The screw that controls ink flow from the ink fountain of a printing press.

Keylines
Lines on a mechanical or negative showing the exact size, shape and location of photographs or other graphic elements. Also called holding lines.

Key Negative or Plate
Negative or plate that prints the most detail, thus whose image guides the register of images from other plates. Also called key printer.

Kiss Die Cut
To die cut the top layer, but not the backing layer, of self-adhesive paper. Also called face cut.

Kiss Impression
Lightest possible impression that will transfer ink to a Substrate.

Kraft Paper
Strong paper used for wrapping and to make grocery bags and large envelopes.