Duo tones – Are made by printing an image with two colors, generally black and a second color. The full range of tones are printed black and the middle range of tones are printed in the second color. The result is a striking image with more richness and depth than a one-color halftone. The image can be further enhanced by printing a tri tone or a quadratone; these are also reproductions of black-and-white images perhaps with a touch of color. The cost of printing tri tones or quadratones may be as high as or higher than four color process printing.

Employment Record – An envelope style with an open side and two side seams under envelope. Designed for employment records but can be used for other filing purposes, manufactured from 100 lb. Ivory Tag to withstand constant handling.

Envelope – A container of flexible material having only two faces, joined at three edges to form an enclosure. The non-joined edge provides an opening for insertion. Opening may later be closed by a gummed or adhesive flap, heat seal, tie string, metal clasp, or other method.

Expansion – An envelope style produced with gussets enabling it to expand to accommodate bulky mail.

Eyelet – A small hole in a tag or envelope to receive a string or clasp. May be plain or reinforced with a metal ring, paper or cloth backing.

First Class Mail – An envelope style printed with a green diamond border recognizable from both sides and the words "FIRST CLASS MAIL" on the face. Available in both flat and expansions styles, various stocks, special sizes, ink colors and gummed or self seal variations.

Flaps Extended – Envelopes with the seal flap extended (not folded down).

Flexography – A low-cost rotary printing technique used on reel fed machines. A direct (not offset) printing method that uses relief plates, similar to rubber stamps, which are made from flexible rubber or photopolymer. The flexible plates are wrapped around a cylinder on the printing press. "Flexo" works best when printing large areas of solid color, making it popular for printing plastic bags, wrapping paper, and milk cartons. Flexographic printing is widely used in envelope production. It's also used for the Sunday color comics and newspaper inserts.

Fluorescent Dye – A coloring agent added to paper to increase its brightness. Fluorescent dyes give white papers added brilliance in natural light and may add a slight cast - like blue or green.

Fluorescent Inks – Printing inks that both emit and reflect light. Generally, these inks are brighter and more opaque than traditional inks. Using one or more fluorescent inks can actually brighten a printed image - especially four-color process images printed on un-coated stock. On the down side, fluorescent inks are not colorfast and will fade in bright light and sunlight over time. They can also have a negative effect on dot gain and trapping, making the printing less sharp and less detailed.
Flush Cut – To cut flush means to cut the top flap off the envelope.

Four-Color Process – A method that uses dots of magenta (red), cyan (blue), yellow, and black to simulate the continuous tones and variety of colors in a color image).

Glassine – A super-calendered, smooth, dense, transparent or semi-transparent paper-based material used to cover windows on envelopes, alternative plastic-based films are also available. Glassine can be used colorless or in various colors.

Grade – A type or class of paper identified as having the same composition and characteristics.

Grain – In paper, grain is the predominant direction of the fibers, parallel with the web as it leaves the papermaking machine.

Grain Long – Grain running along the length, or long side, of a sheet of paper (23" x 35"). Fibers line up parallel to the long side of the paper.

Grain Short – Grain running along the width, or short side, of a sheet of paper (35"x23"). Fibers line up parallel to the short side of the paper.

Gum – A generic term, referring to a broad class of synthetic and natural adhesive materials which exhibit good tack characteristics.

Gummer – Machine used for applying a coating of water remoistenable or solvent-activated adhesive to seams and seal flaps of envelope blanks.

Heat Seal – A method of uniting two or more surfaces by fusion, either of the coatings or of the base materials, under controlled conditions of temperature, pressure and time.

Heavy Duty Mailing – An envelope style designed for mailing large quantities of letter-sized papers open side, center seam construction with an extra large gummed flap that allows for expansion yet is light enough to be economical. Manufactured form heavy weight, high tear strength paper.

Indicia – A postal permit pre-printed on the upper right hand corner of an envelope showing that a fee has been paid to obtain special mailing privileges.

Ink, Flexographic (formerly called aniline ink) – Ink consisting of a pigment, but more frequently a dye, dispersed in a vehicle made from resin and a volatile solvent. Aniline ink is usually printed from rubber or photopolymer plates and is fast-drying.

Ink Fountain – The reservoir of ink on a printing press at the beginning of the ink distribution system.

Inside Tint – A printed design on the inside of the envelope to create greater opacity. May be standard design or special.

Interdepartmental Mail – An envelope style that is available with or without string and button fastener closures, designed to be used as a carrier of documents sent from one person to another within a company. Manufactured from heavy weight tear-strength paper. Drilled with 6 holes to allow instant verification of contents.

Job Ticket – An envelope style manufactured form durable 100 lb. Ivory Tag with open end, center seam.

Jute – A high strength paper or paperboard made of jute fibers.

Kraft – An unbleached sulphite paper with great strength.

Kwik-TakÒ – Envelopes that have a self-sealing, pressure sensitive non-moistening adhesive on the flap of the envelope covered by a removable paper. When the paper is removed and the flap is folded on to the body of the envelope a strong bond is formed upon contact.

Legal File – An envelope style manufactured form 125 lb. Ivory Tag for extra durability with an open side and two seam over shoulders with a deep rounded corner wallet flap, available with or without gummed seal flap. The legal file envelope in an excellent choice for filing or mailing legal size papers.

Letterpress – A printing process that employs a relief or raised, inked image that comes into direct contact with the material being printed. Letterpress printing can be performed from metal type or plates, rubber plates, or plastic plates; using rotary, flatbed or platen press.

Lithography – A high quality printing process.

Mail Pouch – Prepackaged envelopes in small quantity boxes, for off-the-shelf or point of purchase sales.

Manila – A semi-bleached chemical sulfate paper, not as strong as Kraft, but with better printing qualities.

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