PROTECTIVE LABEL SUBSTANCE CONTAINING DIAMOND MICROCRYSTALS WITH ACTIVE NV-CENTRES, DOPED WITH ISOTOPES, METHOD FOR PRODUCTION THEREOF, METHOD FOR PROTECTION FROM COUNTERFEITING AND AUTHENTICATION OF ARTICLES USING SAID LABEL Russian patent published in 2016 - IPC B41M5/00 

FIELD: chemistry.

SUBSTANCE: method of producing at least two types of an active substance of a label for counterfeit-protection of articles, containing diamond microcrystals with active NV centres, distinguishable by the form of optical-radio-frequency double resonance, the method comprising: recording the relationship between the form of optical-radio-frequency double resonance of synthesized diamonds with a ratio of concentration of ¹³C and ¹²C isotopes ranging from 0.011 to 1 and a given ratio of concentrations; dividing said relationship into at least two non-crossing ranges which correspond to said types; for each of types, synthesizing initial diamonds with the ratio of concentration of ¹³C and ¹²C isotopes which falls in the corresponding range; irradiation thereof with a beam of high-energy particles, followed by annealing and grinding into a powder.

EFFECT: wider range of use with simultaneous improvement of the degree of counterfeit protection.

10 cl, 2 dwg