Visible and fluorescent security threads are threads that have a color in daylight and which have the same fluorescence color under Ultra-Violet.
These wires are common in safety booklets and offer a second level of protection, more sophisticated than visible wires and no longer fluorescent.
Examples of these threads are:
- visible in blue and fluorescent blue daylight,
- visible in daylight green and fluorescent green,
- visible in daylight yellow and fluorescent yellow,
- visible in daylight orange and fluorescent orange,
- visible in daylight red and fluorescent red,
- visible in daylight purple and fluorescent purple.