Thermographic printing refers to two types of printing, both of which rely on heat to create the letters or images on a sheet of paper. The areas selected for raised printing are printed with inks that do not contain dryers or hardeners so that they remain wet during the application of powder. This ink will be dried or hardened later during the heating process. It is commonly used on letterheads, business cards, greetings cards, gift wrap, packaging and can also be used to print braille text. It is even sometimes used in diploma printing as an attractive alternative to the more expensive engraving option.