| abstract |
marking an item or substrate, method of providing a marking of an item or substrate and item or a substrate. the present invention relates to the marking of an item or a substrate, which is based on the marking of a precursor composition of chiral nematic liquid crystal (also called cholesteric). prior to curing the chiral liquid crystal precursor composition in the chiral liquid crystal state, at least one optical property exhibited by the composition is modified by means of two different types of modifying agents, in at least one area of the product or substrate . |