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.
Diamone Composite (from Arjowiggins) is a specialized substrate mated with the Diamone anti-soiling treatment. This substrate is composed of 8% to 15% synthetic fibers, the remainder being cotton. This is designed to increase the physical durability of the banknote and thus extend its lifetime further than the Diamone anti-soiling treatment alone.
An optically variable device (often abbreviated as OVD) is a security feature that changes how it appears to the viewer. The banknote or feature itself does not change, but how it interacts with light and viewing conditions makes it seem to vary, to an observer.
Many different security features can be considered OVDs, from color-shifting inks to holograms. There are also many ways to unite an OVD with a banknote, from inserting the feature into the note substrate (in the case of security threads) to printing it onto the surface of the note (in the case of color-shifting inks).
Multiple factors must be considered when determining the suitability of a particular OVD for use on a banknote. Resistance to physical wear, ease of use, the visual significance of the change and resistance to counterfeiting are some (but not all) important factors.
An anti-soiling treatment is a clear coating applied to a banknote before or after printing, intended to extend the lifetime of the banknote by making it more resistant to dirt, oils, moisture and physical wear. An anti-soiling treatment may also be called a varnish, and is sometimes abbreviated as “AST.” The treatment may also be designed to improve ink adhesion to the substrate.
By improving resistance of the note to dirt, oils, moisture and physical wear, the circulating lifetime of the note can be extended, before it becomes unsatisfactory and must be withdrawn from circulation and destroyed. Cleanliness and physical damage affect not only a note’s reliability and ease-of-use in person-to-person transactions, but also how well the note may be handled by bill validators and cash handling machines, such as ATMs and vending machines.
Polarisafe is a security ink developed by Landqart. It comprises a standard UV fluorescence and a polarized UV light reaction described as a ‘twinkling’ effect.