Ootje Oxenaar

Banknote with portrait of a famous Dutchman 
and the Revolutionary series of bills without portraits

Oxenaar insisted that he gained insight into all security techniques that printer Joh. Enschedé would use to prevent his designs from being modified during production. That's happened with his first banknote, the five-gold bill from 1966. Oxenaar has also been the founder of using bright colors of banknotes, each coupure having its own color, making them easy to distinguish. This principle has been continued with the euro. LINK ECB