Visible and fluorescent fibres are fibres which have one colour in daylight and are therefore visible into the paper, and are fluorescent under UV light in the same colour.

Those fibres are usual in security documents and offer a second level of security, more sophisticated than fibres which are visible and not fluorescent.

Examples of those fibres 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.