| abstract |
The present invention relates to the field of protecting security documents, in particular banknotes, against fraudulent acts such as robbery or theft. In particular, the present invention relates to the field of ink compositions for generating irreversibly magnetically induced images or patterns, wherein the ink is orientable upon application of a magnetic field and is one or more types. Polychromaticity comprising at least one first part (2) containing dyes and / or pigments and at least one second part (3) containing one or more magnetic or magnetizable materials Core comprising a microsphere, preferably a dichroic microsphere (1), the microsphere (1) having, as a first part, a surface and containing one or more dyes and / or pigments (2) and the second part includes a partial coating (3) covering at least part of the surface of the core (2) and containing one or more magnetic or magnetizable materials. [Selection] Figure 2 |