| 摘要 |
FIELD: safety.SUBSTANCE: invention relates to protection of valuable documents and items against forgery and illegal reproduction. Proposed protective thread or strip include: I) first optically variable layer, colour impression of which depends on the viewing angle; II) second optically variable layer, colour impression from which otherwise depends on the viewing angle; III) first chromatically permanent layer, the colour of which coincides with colour impression from the first or second optically variable layer at a certain first angle of view; IV) second chromatically permanent layer, the colour of which coincides with colour impression from the first or second optically variable layer at the second angle of view; and v) substrate, wherein both optically variable and both chromatically permanent layers are visible together with one side of the protective thread or strip.EFFECT: in particular this invention relates to protective threads or tapes arranged in or on valuable documents and to valuable documents containing mentioned protective thread or strip.29 cl, 10 dwg |
