Method of producing a piezochromic printing ink, piezochromic printing ink, and method of producing a security element

摘要

The invention relates to a process for producing a printing ink, comprising providing a piezochromic, liquid-crystalline material as a continuous layer, the material comprising a cholesteric phase and a compressible elastomer, breaking the material into platelet-shaped pigments and introducing it into a suitable binder. The invention further relates to a method for producing a security element, comprising printing a substrate with the above printing ink.