What is Bioguard?

Bioguard is “a banknote substrate treatment limiting germ proliferation, making it more resistant to viruses, bacteria and microscopic fungi throughout its lifetime. Bioguard is added to the paper during manufacture, protecting the surface of the paper and its fibre structure against microbes. This product is manufactured from natural materials such that it poses no threat to human health.”

Source: Billetaria, issue 9, April 2011. Page 13. English version. Published by the Banco de España.