This is a simple 2 to 3 step process. The artwork you want foiled is first printed in a rich black through a digital press using a toner. The sheet is then run through a heated laminating process (sometimes referred to as sleeking) where the foil adheres to the black printed image. The sheet can then run through the digital printer where CMYK can run alongside the foiled areas, or in many cases, over the foil creating all types of metallic colors.