| 摘要 |
FIELD: falsification protection. ^ SUBSTANCE: invention relates to manufacturing paper documents and other paper produce protected against falsification, in particular against etching of text. Method comprises preparing paper pulp and dosing paste containing substance protecting paper against etching of text with organic solvent, glycerol or sodium-carboxymethylcellulose, and sodium lauryl ethyl sulfosuccinate, said protective substance being selected from 1,5-di-p-tolydineoantraquinone, 1,4-di-p-tolydineoantraquinone, and their mixture with alcohol-soluble violet dye. Thereafter, paper is manufactured and impregnated with aqueous solution of binder followed by drying and treatment. Before impregnation, to binder is added indicator composition based of diphenylguanidine salt supplemented by indicator additives changing their color upon interaction with inorganic reagents. ^ EFFECT: simplified procedure and ensured protection against etching by various-nature substances. ^ 4 cl, 4 ex |
