SAEKERHETSPAPPER MED KAMOUFLAGEMATERIAL FOER ATT SKYDDA DESS AEKTHETSKAENNETECKEN SAMT FOERFARANDE FOER FRAMSTAELLNING DAERAV

摘要

A data carrier having excitable marking materials to record information in code and further materials to camouflage them, as well as a method of producing this type of data carrier. The coded information is given in the form of the local presence or absence of the excitable marking materials, and is read by detecting the state of excitation, which can only be done with difficulty. The camouflage materials have the function of preventing the detection of the marking material pattern indirectly by means of a chemical laboratory analysis; this camouflage is successful when materials are used which are very similar chemically to the marking materials, and in particular yield the same results as these in a chemical laboratory analysis, but are not excitable with the same means or in the same manner.