In the United States, paper money is traditionally green because of historical printing choices and practical benefits. Early banknotes in the nineteenth century used green ink that was relatively resistant to chemical changes and difficult to reproduce accurately with older printing technologies. The color helped deter counterfeiters and made notes more durable over time. Green also became associated with stability and trust, reinforcing confidence in the currency. Once the design stuck in public imagination, the government continued using green as a recognizable brand for its notes. Other countries use different color schemes, but U.S. currency’s green look became iconic.