This family of inks, always of black colour, is used for printing security documents.

By using specific pigments which give a conductiblilty to those inks, and therefore to the printed area, authentification of the document is made by using a special Bip-Pen which will emit immediately a green light if the document is the original, or a red light if the document is not the oiriginal. The Bip-Pen is sold by Petrel.

Those inks can be printed in offset, water-based or solvent based flexography, solvent-based silk-screen, and have only a black colour.