Thermography


Thermography printing is a post print process done immediately after printing. It can be done inline or offline as long as the ink is wet. Thermography powder is applied to the sheet of paper after it leaves the printing press. The sheet is then vacuumed or shaken to remove excess powder. This leaves powder only where there is wet ink. The sheet then travels through a heat tunnel; there the heat causes the powder to melt which leaves a raised effect.
Thermography printing is commonly used on letterheads, business cards, greetings cards, gift wrap, packaging and can also be used to print braille text. (From wikipedia.org)