Paper - the quality of banknote paper is one of the characteristic features that distinguishes a genuine banknote from a forgery. The banknotes are made of special banknote paper of natural colour, which has several security features, i.e. watermark, windowed security thread or polyester security thread with microtext, and fibres fluorescing under ultraviolet light.

Triple-coloured visible security fibres are incorporated in the paper on the margins of the 5000 Sk banknote. On the front side, on oval gold-coloured higly reflective foil is hot-stamped into the paper, and there is a 23 mm-wide strip with gold-coloured iridescent coating on the back of the note. Iridescent coating violet coloured is applied of back side od 200 Sk banknote too. On the 1000 Sk banknote series 1999 the iridescent coating in red with multiple pattern featuring stylised thorns of the rose is applied.

Security features of the banknotes