All of the inks used in banknote printing offer a certain amount of security because they are not commercially available and hence not available to would - be counterfeiters. The inks used have to have a very high performance and be very resistant to environmental conditions such as sunlight, heat, moisture, etc. 

              1. Optically Variable Inks :  Optically variable inks or OVI contain tiny flakes of special film which changes colour as the viewing angle is varied. The result is an ink which has this same optical property, changing colour as the viewing angle is varied. They are very costly inks and generally only used in small certain areas. 

Tilt the banknote : the denomination numeral at the right corner will change from green into purple.


Tilt the banknote : the denomination numeral at the right corner will change from gold into green.

              2. Fluorescent Inks : Materials which fluoresce under ultra violet light can be added to most inks. They can be incorporated into a visible design element or an invisible design element (i.e. printed as a transparent feature). When viewed under ultra violet light all is revealed. The following graphic design shows what this note revealed under UV light.

This feature also appears on some parts of the designs on the front of the note.


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