Hot foil stamping is a printing process where solid images are stamped to a material surface using a heat impression from pre-dried ink or foils. Foils can include a wide range of reflective and matte metallic colours, solid colours and holographic finishes which are not achievable using wet inks.
Cold foil printing is applied inline to the press sheet, using a metallic film with a removable liner. An adhesive pulls the metallic foil off the liner before adhering it to the press sheet. As this process inline on the press, the foil can be overprinted or altered using the CMYK colour gamut.