ARTICLE WITH AID TO CHECK AUTHENTICITY Russian patent published in 1999 - IPC

FIELD: prevention of forgery. SUBSTANCE: decorative-information article is related predominantly to printed matter and can be used in securities, documents, lottery tickets, labels, etc. Article has base with aid to check authenticity of article. Aid to check authenticity of article includes at least two thermal inductors of liquid-crystal type forming one group as minimum. Thermal inductors in group are characterized by fact that in liquid-crystal state they have at least one and same specified color in interval of temperatures forming series in which minimal temperature of next interval of temperatures of series is higher than maximal temperature of previous interval of temperatures of series. Groups of thermal indicators can be placed on base separately. EFFECT: avoidance of errors while checking authenticity of article. 1 cl, 22 dwg