PRINTED, MACHINE-READABLE CODE, DOCUMENT PROVIDED WITH A CODE OF THIS TYPE AND A METHOD FOR PRODUCING SAID CODE AND DOCUMENT

摘要

Coding 1, in particular a bar code, is printed by intaglio printing on substrate 10, in particular a bank note. Individual coding areas 2, 3, 4 differ in their ink layer thickness. The printing ink contains luminescent and/or electroconductive and/or x-ray absorbing and/or infrared radiation absorbing substances, so that the different ink layer thicknesses can be differentiated by different signal intensities.