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Thermography is perhaps the most popular method of printing invitations, because it is both affordable and pleasing to the eye. This method involves sprinkling a special resin powder on the printed invitation while the ink is still wet and then exposing the piece to heat. The powder and ink fuse together causing the lettering to rise atop the surface of the paper. The end result is similar to engraving, but it is not as expensive.
Engraving is a prestigious tradition that raises your lettering above the surface of the invitation while leaving slight indentations on the reverse side of the paper. The elegant look of engraved stationery is produced by filling the crevices of an etched copperplate with ink, feeding the paper into the press and then stamping rubber stamp catalog the paper between the copperplate and another hard surface. The result is a three-dimensional masterpiece! Some printers will even send you the original copperplate with your invitation orders as a unique and lasting keepsake.
Letterpress is a finely crafted technique that involves pressing an inked raised surface such as a metal plate into soft paper (hard or thin papers won't create as deep of an imprint). This pressure creates an impressed image, leaving your wording crisp and sharp in appearance. Letterpress printing is a detailed process that may need an extended production period, so be sure to allow more time. This process results in the highest possible printed quality, giving your invitations unmatched beauty and distinct character.
Hope this helps and makes your decision a bit easier. Article courtesy of http://yourweddinggirl.carlsoncraft.com/index.jsp.
