Abbreviation for black in four-color process printing. Hence the 'K' in CMYK. 
(1) The screw that controls ink flow from the ink fountain of a printing press. 
(2) To relate loose pieces of copy to their positions on a layout or mechanical using a system of numbers or letters. 
(3) Alternate term for the color black, as in 'key plate.' 
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. 
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