Substance for marking the authenticity of banknotes, securities and documents and method for producing same

摘要

Invention relates to the field of protection of bank notes, secured papers and documents and may be used to manufacture marks, containing active centres of nitrogen-vacancy in nanocrystals of diamond, to apply them in the form of substance on specified objects to verify authenticity of the latter. Substance of marks represents suspension containing nanocrystals of diamond with centres of nitrogen-vacancy (NV centres) and liquid carrier. Specified liquid carrier represents a dissolvent, for instance, propanol, which includes stabiliser substance preventing aggregation (sticking) of specified diamond nanocrystals, for instance, of 0.5-5.0 wt % of polyvinyl pyrrolidone. Diamond nanocrystals represent nanocrystals of natural and/or synthetic diamonds modified so that there is a concentration of specified NV centres in them in the range from 1017 to 1019 units in cm3, and at that concentration of nanocrystals in specified suspension makes 3-10.10-4 g/ml.