DECKLE EDGE - Feathered edge on envelope flap deliberately produced for decorative purposes. Formed especially on formal announcement or invitation envelopes.

DIAGONAL GRAIN CUTTING - The grain of the paper runs diagonally across the face of the envelope (corner to corner). Also known as cross grain or random cutting.

DIAGONAL SEAM - A seam running diagonally from the bottom fold and comes upward toward the throat of the envelope.

DIE - In envelope making, this term usually refers to a high die for cutting envelope blanks or a window die for cutting a window opening.

DIE-CUT - A process of cutting envelope blanks utilizing a high die.

DOCUMENT ENVELOPE - Sometimes referred to as legal envelopes, these are large, open side, double side seam outside, hex flap envelopes produced from heavy manila or brown kraft stock with heavy seal gum, used for mailing and storage of documents requiring security and confidentiality.

DRY OFFSET - Better quality. 120 line screen maximum. Oil or rubber based inks.

DUOTONE - A common printing technique by which a halftone is printed in two ink colors, most often black and another color.

DYLUX - A fast self-fixing proofing paper that is sensitive on both sides.