Visible and fluorescent threads are threads which have a colour in daylight and have the same colour under UV lights.

Those threads are used in security booklets and offer a second security level, more sophisticated than visible and non fluorescent threads.

Example of those threads are:

•  visible blue in daylight and fluo blue under UV light,
•  visible green in daylight and fluo green under UV light,
•  visible yellow in daylight and fluo yellow under UV light,
•  visible orange in daylight and fluo orange under UV light,
•  visible red in daylight and fluo red under UV light,
•  visible violet in daylight and fluo violet under UV light.