| 摘要 |
FIELD: printing industry. ^ SUBSTANCE: invention relates to methods to protect documents made on paper, cardboard, etc. with application of dyes, ink, etc. by means of application of texts, symbols, codes, manually or with the help of any printing device, onto their surface. Method is based on adding nanoparticles of ferromagnetic material or ferromagnetic material mixture with previously specified magnetic resonant properties. At the same time the document authenticity is verified at EPR spectrometre by comparison of magnetic resonance curve type of separate symbols or other document fragments with reference dye curve, which is produced at the moment of its manufacturing. ^ EFFECT: increased extent of documents counterfeit protection, at the same time authenticity check is carried out using complex measurement procedure and is characterised by high security. ^ 1 dwg, 1 tbl |
