The security features used in banknotes include, among others, anti-copying background made of very thin lines, multi-colour iris, i.e., gradual shift from one colour to the other along the entire banknote, recto-verso, negative and positive microprints. In addition, special inks, such as latent or UV active inks, may also be used in the printing process. Steel engraving is a security feature itself and not many printing houses in the world are able to use this technology. The characteristic raising of the printed motif is easy to detect by the user and helps to verify authenticity of a banknote. Additionally, this technology allows for introducing additional security features, such as, for example, latent image, micro-prints, optically changing rosettes, as well as the use of special-feature inks.