Rainbow Fibres™

The small size of the fibre, combined with the variety of fluorescent colours in precise register, makes it difficult to counterfeit, yet the ‘Rainbow’ appearance of the fibres make it easy to describe and easy for the observer to determine, making this a semi-public security feature.

4C Rainbow fibres are completely invisible in normal light but under ultra-violet light, they fluoresce in four different colours along the length of the fibre. We can combine dual fluorescence, so that colours are different under long wave and short wave fluorescence. An additional level 3 security layer could even be added, if desired.

Rainbow and multi-colour fibres are recognised as a highly effective and economic security feature. They’re used in banknotes and high value documents throughout the world.