UV-fluorescent Hi-lites
Small coloured or colourless particles embedded in the paper during the manufacturing process. The particles glow when exposed to UV light (fig. 1).
![](https://static-content.regulaforensics.com/Glossary/Banknotes/S-Z/Uv-fluorescent_Hi-lites_01.webp)
a
![](https://static-content.regulaforensics.com/Glossary/Banknotes/S-Z/Uv-fluorescent_Hi-lites_02.webp)
b
![](https://static-content.regulaforensics.com/Glossary/Banknotes/S-Z/Uv-fluorescent_Hi-lites_03.webp)
c
Fig. 1. UV-fluorescent hi-lites. 5 000 Costa Rican Colones (2005):
a – Hi-lites glowing under UV light; b – zoomed image under white light; c – zoomed image under UV light