Foil stamping is the application of metallic or pigmented foil on to a solid surface by application of a heated metal die. Combining heat with pressure makes it permanently adhere to the surface below leaving the design of the die. The die is an etched or machined piece of metal typically made from copper or magnesium. The foil can be metallic in a variety of colors, gloss or matte pigment or holographic in appearance. The process can be combined with embossing, debossing, or offset printing techniques to enhance its appearance.