K
Symbol for black in four-color printing.

Kerning
The narrowing of space between letters so that they become closer and take up less space on the page.

Key Plate
The printing plate that is used as a guide for the other plates in the color printing process; it usually has the most detail.

Keying
The use of symbols, usually letters, to code copy that will appear on a dummy.

Keyline
Lines that are drawn on artwork that indicate the exact placement, shape and size of elements including halftones, illustrations etc.

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

Kiss Impression
A delicate printed impression, just heavy enough to be seen.

Knock out
To mask out an image. 

Kraft Paper
A coarse, strong, unbleached paper used for industrial products or packing.