| 摘要 |
FIELD: paper designed for provision of identification of authenticity of documents, bank notes, bonds, tickets, cards and other kinds of securities or business papers. SUBSTANCE: at least two chemical reagents are introduced in the paper, each providing for progress of the color reaction of this chemical reagent, and an indicator of authenticity at a rate not coinciding with the rate of progress of the color reaction of each of the rest chemical reagents with this indicator of authenticity. The color at least of one of the products of reaction of each chemical reagent with the indicator of authenticity differs from the color at least of one of the products of reaction of each of the rest chemical reagents with this indicator of authenticity. EFFECT: enhanced efficiency of protection of printed documents against forgery due to difficulty of decoding and reproduction of the paper composition. 14 cl, 4 ex |
